diff --git a/application/controllers/api/frontend/v1/stv/Students.php b/application/controllers/api/frontend/v1/stv/Students.php
index ae83fa4ff..a8f076b88 100644
--- a/application/controllers/api/frontend/v1/stv/Students.php
+++ b/application/controllers/api/frontend/v1/stv/Students.php
@@ -25,9 +25,6 @@ if (! defined('BASEPATH')) exit('No direct script access allowed');
  */
 class Students extends FHCAPI_Controller
 {
-	private $allowedStgs = [];
-
-
 	public function __construct()
 	{
 		$permissions = [];
@@ -35,16 +32,17 @@ class Students extends FHCAPI_Controller
 		$permissions[$router->method] = ['admin:r', 'assistenz:r'];
 		parent::__construct($permissions);
 
-		$this->allowedStgs = $this->permissionlib->getSTG_isEntitledFor('admin') ?: [];
-		$this->allowedStgs = array_merge($this->allowedStgs, $this->permissionlib->getSTG_isEntitledFor('assistenz') ?: []);
+		$allowedStgs = $this->permissionlib->getSTG_isEntitledFor('admin') ?: [];
+		$allowedStgs = array_merge($allowedStgs, $this->permissionlib->getSTG_isEntitledFor('assistenz') ?: []);
 		
-		if (!$this->allowedStgs) {
+		if (!$allowedStgs) {
 			$this->_outputAuthError([$router->method => ['admin:r', 'assistenz:r']]);
 			exit;
 		}
 
 		// Load Libraries
 		$this->load->library('PhrasesLib');
+		$this->load->library('stv/StudentListLib', ['allowedStgs' => $allowedStgs]);
 		$this->loadPhrases(
 			array(
 				'lehre'
@@ -111,23 +109,19 @@ class Students extends FHCAPI_Controller
 		]);
 		
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-
-		$this->PrestudentModel->addJoin(
+		$this->studentlistlib->addJoin(
 			"(
 				SELECT prestudent_id 
 				FROM public.tbl_prestudentstatus
 				WHERE status_kurzbz = 'Incoming'
 				AND studiensemester_kurzbz = " . $this->PrestudentModel->escape($studiensemester_kurzbz) . "
 			) test",
-			"prestudent_id"
+			"prestudent_id",
+			"",
+			"start"
 		);
 
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-		$this->PrestudentModel->addSelect("COALESCE(
+		$this->studentlistlib->addSelect("COALESCE(
 			v.semester::text, 
 			CASE 
 				WHEN pls.status_kurzbz IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
@@ -135,16 +129,13 @@ class Students extends FHCAPI_Controller
 				ELSE ''::text 
 			END
 		) AS semester", false);
-		$this->PrestudentModel->addSelect("COALESCE(v.verband::text, ''::text)");
-		$this->PrestudentModel->addSelect("COALESCE(v.gruppe::text, ''::text)");
-		
-		$this->addSelectPrioRel();
+		$this->studentlistlib->addSelect("COALESCE(v.verband::text, ''::text) AS verband");
+		$this->studentlistlib->addSelect("COALESCE(v.gruppe::text, ''::text) AS gruppe");
+
 
 		$this->addFilter($studiensemester_kurzbz);
 
-
-		$result = $this->PrestudentModel->load();
-		
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -164,10 +155,7 @@ class Students extends FHCAPI_Controller
 		]);
 		
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-
-		$this->PrestudentModel->addJoin(
+		$this->studentlistlib->addJoin(
 			"(
 				SELECT prestudent_id 
 				FROM bis.tbl_bisio bis 
@@ -187,14 +175,12 @@ class Students extends FHCAPI_Controller
 				) AND stdsem.studiensemester_kurzbz = " . $this->PrestudentModel->escape($studiensemester_kurzbz) . "
 				GROUP BY prestudent_id
 			) test",
-			"prestudent_id"
+			"prestudent_id",
+			"",
+			"start"
 		);
 
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-
-		$this->PrestudentModel->addSelect("COALESCE(
+		$this->studentlistlib->addSelect("COALESCE(
 			v.semester::text, 
 			CASE 
 				WHEN pls.status_kurzbz IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
@@ -202,16 +188,13 @@ class Students extends FHCAPI_Controller
 				ELSE ''::text 
 			END
 		) AS semester", false);
-		$this->PrestudentModel->addSelect("COALESCE(v.verband::text, ''::text)");
-		$this->PrestudentModel->addSelect("COALESCE(v.gruppe::text, ''::text)");
+		$this->studentlistlib->addSelect("COALESCE(v.verband::text, ''::text) AS verband");
+		$this->studentlistlib->addSelect("COALESCE(v.gruppe::text, ''::text) AS gruppe");
 		
-		$this->addSelectPrioRel();
 
 		$this->addFilter($studiensemester_kurzbz);
 
-
-		$result = $this->PrestudentModel->load();
-		
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -231,23 +214,18 @@ class Students extends FHCAPI_Controller
 		]);
 		
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-
-		$this->PrestudentModel->addJoin(
+		$this->studentlistlib->addJoin(
 			"(
 				SELECT prestudent_id
 				FROM bis.tbl_mobilitaet 
 				WHERE studiensemester_kurzbz = " . $this->PrestudentModel->escape($studiensemester_kurzbz) . "
 			) bis",
-			"prestudent_id"
+			"prestudent_id",
+			"",
+			"start"
 		);
 
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-
-		$this->PrestudentModel->addSelect("COALESCE(
+		$this->studentlistlib->addSelect("COALESCE(
 			v.semester::text, 
 			CASE 
 				WHEN pls.status_kurzbz IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
@@ -255,16 +233,13 @@ class Students extends FHCAPI_Controller
 				ELSE ''::text 
 			END
 		) AS semester", false);
-		$this->PrestudentModel->addSelect("COALESCE(v.verband::text, ''::text)");
-		$this->PrestudentModel->addSelect("COALESCE(v.gruppe::text, ''::text)");
+		$this->studentlistlib->addSelect("COALESCE(v.verband::text, ''::text) AS verband");
+		$this->studentlistlib->addSelect("COALESCE(v.gruppe::text, ''::text) AS gruppe");
 		
-		$this->addSelectPrioRel();
 
 		$this->addFilter($studiensemester_kurzbz);
 
-
-		$result = $this->PrestudentModel->load();
-		
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -313,8 +288,6 @@ class Students extends FHCAPI_Controller
 	 */
 	protected function fetchPrestudents($studiengang_kz, $studiensemester_kurzbz = null, $filter = null, $orgform_kurzbz = null)
 	{
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
 		$stdsemEsc = $studiensemester_kurzbz ? $this->PrestudentModel->escape($studiensemester_kurzbz) : 'NULL';
 
 		$selectRT = "
@@ -331,38 +304,38 @@ class Students extends FHCAPI_Controller
 			AND r.studiensemester_kurzbz=" . $stdsemEsc;
 
 		
-		$where = ['tbl_prestudent.studiengang_kz' => $studiengang_kz];
+		$this->studentlistlib->addWhere('tbl_prestudent.studiengang_kz', $studiengang_kz);
 
 		if ($orgform_kurzbz) {
-			$where['ps.orgform_kurzbz'] = $orgform_kurzbz;
+			$this->studentlistlib->addWhere('ps.orgform_kurzbz', $orgform_kurzbz);
 		}
 
 		switch ($filter) {
 			case "interessenten":
-				$where['ps.status_kurzbz'] = 'Interessent';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
 				break;
 			case "bewerbungnichtabgeschickt":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$where['ps.bewerbung_abgeschicktamum'] = null;
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('ps.bewerbung_abgeschicktamum IS NULL');
 				break;
 			case "bewerbungabgeschickt":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$where['ps.bewerbung_abgeschicktamum IS NOT NULL'] = null;
-				$where['ps.bestaetigtam'] = null;
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('ps.bewerbung_abgeschicktamum IS NOT NULL');
+				$this->studentlistlib->addWhere('ps.bestaetigtam IS NULL');
 				break;
 			case "statusbestaetigt":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$where['ps.bestaetigtam IS NOT NULL'] = null;
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('ps.bestaetigtam IS NOT NULL');
 				break;
 			case "statusbestaetigtrtnichtangemeldet":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$where['ps.bestaetigtam IS NOT NULL'] = null;
-				$this->PrestudentModel->db->where('NOT EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('ps.bestaetigtam IS NOT NULL');
+				$this->studentlistlib->addWhere('NOT EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "statusbestaetigtrtangemeldet":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$where['ps.bestaetigtam IS NOT NULL'] = null;
-				$this->PrestudentModel->db->where('EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('ps.bestaetigtam IS NOT NULL');
+				$this->studentlistlib->addWhere('EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "zgv":
 				$this->load->model('organisation/Studiengang_model', 'StudiengangModel');
@@ -374,69 +347,69 @@ class Students extends FHCAPI_Controller
 					$this->terminateWithSuccess([]);
 				$stg = current($stg);
 
-				$where['ps.status_kurzbz'] = 'Interessent';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
 				
 				if ($stg->typ == 'm') {
-					$where['zgvmas_code IS NOT NULL'] = null;
+					$this->studentlistlib->addWhere('zgvmas_code IS NOT NULL');
 					if (defined('ZGV_ERFUELLT_ANZEIGEN') && ZGV_ERFUELLT_ANZEIGEN)
-						$where['zgvmas_erfuellt'] = true;
+						$this->studentlistlib->addWhere('zgvmas_erfuellt', true);
 				} elseif ($stg->typ == 'p') {
-					$where['zgvdoktor_code IS NOT NULL'] = null;
+					$this->studentlistlib->addWhere('zgvdoktor_code IS NOT NULL');
 					if (defined('ZGV_DOKTOR_ANZEIGEN') && ZGV_DOKTOR_ANZEIGEN)
-						$where['zgvdoktor_erfuellt'] = true;
+						$this->studentlistlib->addWhere('zgvdoktor_erfuellt', true);
 				} else {
-					$where['zgv_code IS NOT NULL'] = null;
+					$this->studentlistlib->addWhere('zgv_code IS NOT NULL');
 					if (defined('ZGV_ERFUELLT_ANZEIGEN') && ZGV_ERFUELLT_ANZEIGEN)
-						$where['zgv_erfuellt'] = true;
+						$this->studentlistlib->addWhere('zgv_erfuellt', true);
 				}
 				break;
 			case "reihungstestangemeldet":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$this->PrestudentModel->db->where('EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "reihungstestnichtangemeldet":
-				$where['ps.status_kurzbz'] = 'Interessent';
-				$this->PrestudentModel->db->where('NOT EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Interessent');
+				$this->studentlistlib->addWhere('NOT EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "bewerber":
-				$where['ps.status_kurzbz'] = 'Bewerber';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Bewerber');
 				break;
 			case "bewerberrtnichtangemeldet":
-				$where['ps.status_kurzbz'] = 'Bewerber';
-				$this->PrestudentModel->db->where('NOT EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Bewerber');
+				$this->studentlistlib->addWhere('NOT EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "bewerberrtangemeldet":
-				$where['ps.status_kurzbz'] = 'Bewerber';
-				$this->PrestudentModel->db->where('EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Bewerber');
+				$this->studentlistlib->addWhere('EXISTS(' . $selectRT . ')', null, false);
 				break;
 			case "bewerberrtangemeldetteilgenommen":
-				$where['ps.status_kurzbz'] = 'Bewerber';
-				$this->PrestudentModel->db->where('EXISTS(' . $selectRT . ')', null, false);
-				$where['reihungstestangetreten'] = true;
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Bewerber');
+				$this->studentlistlib->addWhere('EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('reihungstestangetreten', true);
 				break;
 			case "bewerberrtangemeldetnichtteilgenommen":
-				$where['ps.status_kurzbz'] = 'Bewerber';
-				$this->PrestudentModel->db->where('EXISTS(' . $selectRT . ')', null, false);
-				$where['reihungstestangetreten'] = false;
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Bewerber');
+				$this->studentlistlib->addWhere('EXISTS(' . $selectRT . ')', null, false);
+				$this->studentlistlib->addWhere('reihungstestangetreten', false);
 				break;
 			case "aufgenommen":
-				$where['ps.status_kurzbz'] = 'Aufgenommener';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Aufgenommener');
 				break;
 			case "warteliste":
-				$where['ps.status_kurzbz'] = 'Wartender';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Wartender');
 				break;
 			case "absage":
-				$where['ps.status_kurzbz'] = 'Abgewiesener';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Abgewiesener');
 				break;
 			case "incoming":
 				// NOTE(chris): in FAS it was not filtered for studiengang_kz
-				$where['ps.status_kurzbz'] = 'Incoming';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Incoming');
 				break;
 			case "absolvent":
-				$where['ps.status_kurzbz'] = 'Absolvent';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Absolvent');
 				break;
 			case "diplomand":
-				$where['ps.status_kurzbz'] = 'Diplomand';
+				$this->studentlistlib->addWhere('ps.status_kurzbz', 'Diplomand');
 				break;
 			default:
 				if (!$studiensemester_kurzbz) {
@@ -444,9 +417,9 @@ class Students extends FHCAPI_Controller
 					 * show all prestudents in this stg who don't have a status
 					 * $orgform_kurzbz does not change the results since orgform is stored in the status table
 					 */
-					$where['ps.status_kurzbz'] = null;
+					$this->studentlistlib->addWhere('ps.status_kurzbz IS NULL');
 				} else {
-					$this->PrestudentModel->db->where_in('ps.status_kurzbz', [
+					$this->studentlistlib->addWhere('ps.status_kurzbz', [
 						'Interessent',
 						'Bewerber',
 						'Aufgenommener',
@@ -457,23 +430,21 @@ class Students extends FHCAPI_Controller
 				break;
 		}
 
-		$this->prepareQuery($studiensemester_kurzbz);
-		
-		$this->PrestudentModel->addSelect("
+		$this->studentlistlib->addSelect("
 			CASE 
 				WHEN pls.status_kurzbz IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
 				THEN ps.ausbildungssemester::text 
 				ELSE ''::text 
 			END AS semester", false);
-		$this->PrestudentModel->addSelect("'' AS verband");
-		$this->PrestudentModel->addSelect("'' AS gruppe");
-		$this->addSelectPrioRel();
+		$this->studentlistlib->addSelect("'' AS verband");
+		$this->studentlistlib->addSelect("'' AS gruppe");
+
 		$query_studiensemester_kurzbz = $studiensemester_kurzbz ? $this->PrestudentModel->escape($studiensemester_kurzbz) : '\'NULL\'';
-		$this->PrestudentModel->addSelect($query_studiensemester_kurzbz . ' as query_studiensemester_kurzbz');
+		$this->studentlistlib->addSelect($query_studiensemester_kurzbz . ' as query_studiensemester_kurzbz');
 
 		$this->addFilter($studiensemester_kurzbz);
 
-		$result = $this->PrestudentModel->loadWhere($where);
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -576,7 +547,6 @@ class Students extends FHCAPI_Controller
 		$gruppe_kurzbz = null,
 		$orgform_kurzbz = null
 	) {
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
 		$this->load->model('organisation/Studiensemester_model', 'StudiensemesterModel');
 
 		if (!$this->StudiensemesterModel->isValidStudiensemester($studiensemester_kurzbz))
@@ -584,35 +554,30 @@ class Students extends FHCAPI_Controller
 			$this->terminateWithError($studiensemester_kurzbz . ' - ' . $this->p->t('lehre', 'error_noStudiensemester'));
 		}
 
-		$this->prepareQuery($studiensemester_kurzbz, '');
+		// NOTE(chris): overwrite 'LEFT JOIN' with 'JOIN'
+		$this->studentlistlib->addJoin("public.tbl_student s", "prestudent_id");
 
-		$this->PrestudentModel->addSelect('v.semester');
-		$this->PrestudentModel->addSelect('v.verband');
-		$this->PrestudentModel->addSelect('v.gruppe');
-		$this->PrestudentModel->addSelect("'' AS priorisierung_relativ");
-		$this->PrestudentModel->addSelect($this->PrestudentModel->escape($studiensemester_kurzbz) . ' as query_studiensemester_kurzbz');
-
-
-		$where = [];
+		$this->studentlistlib->addSelect("'' AS priorisierung_relativ");
+		$this->studentlistlib->addSelect($this->PrestudentModel->escape($studiensemester_kurzbz) . ' as query_studiensemester_kurzbz');
 
 		if ($gruppe_kurzbz !== null) {
-			$this->PrestudentModel->addJoin('public.tbl_benutzergruppe g', 'uid');
-			$where['g.gruppe_kurzbz'] = $gruppe_kurzbz;
-			$where['g.studiensemester_kurzbz'] = $studiensemester_kurzbz;
+			$this->studentlistlib->addJoin('public.tbl_benutzergruppe g', 'uid', '', 'after_b');
+			$this->studentlistlib->addWhere('g.gruppe_kurzbz', $gruppe_kurzbz);
+			$this->studentlistlib->addWhere('g.studiensemester_kurzbz', $studiensemester_kurzbz);
 		} else {
-			$where['v.studiengang_kz'] = $studiengang_kz;
+			$this->studentlistlib->addWhere('v.studiengang_kz', $studiengang_kz);
 
 			if ($semester !== null)
-				$where['v.semester'] = $semester;
+				$this->studentlistlib->addWhere('v.semester', $semester);
 
 			if ($verband !== null)
-				$where['v.verband'] = $verband;
+				$this->studentlistlib->addWhere('v.verband', $verband);
 
 			if ($gruppe !== null)
-				$where['v.gruppe'] = $gruppe;
+				$this->studentlistlib->addWhere('v.gruppe', $gruppe);
 	
 			if (!$verband && !$gruppe && $orgform_kurzbz !== null) {
-				$this->PrestudentModel->db->where(
+				$this->studentlistlib->addWhere(
 					"(
 						SELECT orgform_kurzbz
 						FROM public.tbl_prestudentstatus 
@@ -626,9 +591,10 @@ class Students extends FHCAPI_Controller
 			}
 		}
 
+
 		$this->addFilter($studiensemester_kurzbz);
 
-		$result = $this->PrestudentModel->loadWhere($where);
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -655,11 +621,8 @@ class Students extends FHCAPI_Controller
 			$this->terminateWithError($studiensemester_kurzbz . ' - ' . $this->p->t('lehre', 'error_noStudiensemester'));
 		}
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-		$this->PrestudentModel->addSelect("COALESCE(
+		
+		$this->studentlistlib->addSelect("COALESCE(
 			v.semester::text, 
 			CASE 
 				WHEN pls.status_kurzbz IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
@@ -667,16 +630,15 @@ class Students extends FHCAPI_Controller
 				ELSE ''::text 
 			END
 		) AS semester", false);
-		$this->PrestudentModel->addSelect("COALESCE(v.verband::text, ''::text)");
-		$this->PrestudentModel->addSelect("COALESCE(v.gruppe::text, ''::text)");
+		$this->studentlistlib->addSelect("COALESCE(v.verband::text, ''::text) AS verband");
+		$this->studentlistlib->addSelect("COALESCE(v.gruppe::text, ''::text) AS gruppe");
+
+		$this->studentlistlib->addWhere('tbl_prestudent.prestudent_id', $prestudent_id);
 
-		$this->addSelectPrioRel();
 
 		$this->addFilter($studiensemester_kurzbz);
 
-		$result = $this->PrestudentModel->loadWhere([
-			'tbl_prestudent.prestudent_id' => $prestudent_id
-		]);
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -703,23 +665,13 @@ class Students extends FHCAPI_Controller
 			$this->terminateWithError($studiensemester_kurzbz . ' - ' . $this->p->t('lehre', 'error_noStudiensemester'));
 		}
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-		$this->PrestudentModel->addSelect('v.semester');
-		$this->PrestudentModel->addSelect('v.verband');
-		$this->PrestudentModel->addSelect('v.gruppe');
-
-		$this->addSelectPrioRel();
-
 
+		$this->studentlistlib->addWhere('s.student_uid', $student_uid);
+		
 
 		$this->addFilter($studiensemester_kurzbz);
 
-		$result = $this->PrestudentModel->loadWhere([
-			's.student_uid' => $student_uid
-		]);
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 		
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -747,21 +699,13 @@ class Students extends FHCAPI_Controller
 			$this->terminateWithError($studiensemester_kurzbz . ' - ' . $this->p->t('lehre', 'error_noStudiensemester'));
 		}
 
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
 
-		$this->prepareQuery($studiensemester_kurzbz);
-
-		$this->PrestudentModel->addSelect('v.semester');
-		$this->PrestudentModel->addSelect('v.verband');
-		$this->PrestudentModel->addSelect('v.gruppe');
-
-		$this->addSelectPrioRel();
+		$this->studentlistlib->addWhere('p.person_id', $person_id);
 
+		
 		$this->addFilter($studiensemester_kurzbz);
 
-		$result = $this->PrestudentModel->loadWhere([
-			'p.person_id' => $person_id
-		]);
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 		
 		$data = $this->getDataOrTerminateWithError($result);
 
@@ -793,30 +737,8 @@ class Students extends FHCAPI_Controller
 
 		$data = $this->getDataOrTerminateWithError($result);
 
-
-		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
-
-		$this->prepareQuery($studiensemester_kurzbz);
-
-		$this->PrestudentModel->addSelect("COALESCE(v.semester::text, CASE WHEN public.get_rolle_prestudent(tbl_prestudent.prestudent_id, NULL) IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') THEN public.get_absem_prestudent(tbl_prestudent.prestudent_id, NULL)::text ELSE ''::text END) AS semester", false);
-		$this->PrestudentModel->addSelect('v.verband');
-		$this->PrestudentModel->addSelect('v.gruppe');
-		$this->PrestudentModel->addSelect($this->PrestudentModel->escape($studiensemester_kurzbz) . ' as query_studiensemester_kurzbz');
-
-		//add status per semester
-		$this->PrestudentModel->addSelect(
-			"public.get_rolle_prestudent(public.tbl_prestudent.prestudent_id, "
-				. $this->PrestudentModel->escape($studiensemester_kurzbz)
-				. ")  AS statusofsemester"
-		);
-
-		$this->addSelectPrioRel();
-
-		$this->addFilter($studiensemester_kurzbz);
-
 		$prestudent_ids = [];
 		$student_uids = [];
-			$this->addMeta('data', $data);
 		foreach ($data as $row) {
 			$dataset = json_decode($row->data);
 			if ($row->type == 'prestudent') {
@@ -826,204 +748,39 @@ class Students extends FHCAPI_Controller
 			}
 		}
 
+
+		$this->studentlistlib->addSelect("COALESCE(
+			v.semester::text, 
+			CASE 
+				WHEN public.get_rolle_prestudent(tbl_prestudent.prestudent_id, NULL) IN ('Aufgenommener', 'Bewerber', 'Wartender', 'interessent') 
+				THEN public.get_absem_prestudent(tbl_prestudent.prestudent_id, NULL)::text 
+				ELSE ''::text 
+			END
+		) AS semester", false);
+
+		$this->studentlistlib->addSelect($this->PrestudentModel->escape($studiensemester_kurzbz) . ' as query_studiensemester_kurzbz');
+
 		if ($prestudent_ids && $student_uids) {
-			$this->PrestudentModel->db->where_in('tbl_prestudent.prestudent_id', $prestudent_ids);
-			$this->PrestudentModel->db->or_where_in('s.student_uid', $student_uids);
+			$this->studentlistlib->addWhere('tbl_prestudent.prestudent_id', $prestudent_ids);
+			$this->studentlistlib->addOrWhere('s.student_uid', $student_uids);
 		} elseif ($prestudent_ids) {
-			$this->PrestudentModel->db->where_in('tbl_prestudent.prestudent_id', $prestudent_ids);
+			$this->studentlistlib->addWhere('tbl_prestudent.prestudent_id', $prestudent_ids);
 		} elseif ($student_uids) {
-			$this->PrestudentModel->db->where_in('s.student_uid', $student_uids);
+			$this->studentlistlib->addWhere('s.student_uid', $student_uids);
 		} else {
 			$this->terminateWithSuccess([]);
 		}
 
-		$result = $this->PrestudentModel->load();
+
+		$this->addFilter($studiensemester_kurzbz);
+
+		$result = $this->studentlistlib->execute($studiensemester_kurzbz);
 
 		$data = $this->getDataOrTerminateWithError($result);
 
 		$this->terminateWithSuccess($data);
 	}
 
-	/**
-	 * @param string|null	$studiensemester_kurzbz
-	 * @param string		$type
-	 *
-	 * @return void
-	 */
-	protected function prepareQuery($studiensemester_kurzbz, $type = 'LEFT')
-	{
-		$stdsemEsc = $studiensemester_kurzbz ? $this->PrestudentModel->escape($studiensemester_kurzbz) : 'NULL';
-
-		$this->load->config('stv');
-
-		if(defined('STV_TAGS_ENABLED') && STV_TAGS_ENABLED)
-		{
-			$tags = $this->config->item('stv_prestudent_tags');
-
-			$whereTags = '';
-			if (is_array($tags) && !isEmptyArray($tags)) {
-				$tags = array_keys($tags);
-
-				foreach ($tags as $key => $tag) {
-					$tags[$key] = $this->db->escape($tag);
-				}
-				$whereTags = " AND nt.typ_kurzbz IN (" . implode(",", $tags) . ")";
-			}
-			$subQueryTag = "
-			  (
-				SELECT
-				  tag.prestudent_id,
-				  COALESCE(json_agg(tag ORDER BY tag.done), '[]'::json) AS tags
-				FROM (
-				  SELECT DISTINCT ON (n.notiz_id)
-					n.notiz_id AS id,
-					nt.typ_kurzbz,
-					array_to_json(nt.bezeichnung_mehrsprachig)->>0 AS beschreibung,
-					n.text AS notiz,
-					nt.style,
-					n.erledigt AS done,
-					nz.prestudent_id
-				  FROM public.tbl_notizzuordnung AS nz
-					JOIN public.tbl_notiz AS n ON nz.notiz_id = n.notiz_id
-					JOIN public.tbl_notiz_typ AS nt ON n.typ = nt.typ_kurzbz "
-				. $whereTags .
-				"
-				) AS tag
-				GROUP BY tag.prestudent_id
-			  ) AS tag_data_agg
-			";
-		}
-
-		$this->PrestudentModel->addJoin('public.tbl_studiengang stg', 'studiengang_kz', 'LEFT');
-		$this->PrestudentModel->addJoin('public.tbl_person p', 'person_id');
-		$this->PrestudentModel->addJoin('public.tbl_student s', 'prestudent_id', $type);
-		$this->PrestudentModel->addJoin('public.tbl_prestudentstatus pls', '
-			pls.status_kurzbz=public.get_rolle_prestudent(tbl_prestudent.prestudent_id, NULL) 
-			AND pls.prestudent_id=tbl_prestudent.prestudent_id 
-			AND pls.studiensemester_kurzbz=public.get_stdsem_prestudent(tbl_prestudent.prestudent_id, NULL) 
-			AND pls.ausbildungssemester=public.get_absem_prestudent(tbl_prestudent.prestudent_id, NULL)', 'LEFT');
-		$this->PrestudentModel->addJoin('lehre.tbl_studienplan sp', 'studienplan_id', 'LEFT');
-		$this->PrestudentModel->addJoin('public.tbl_benutzer b', 's.student_uid=b.uid', 'LEFT');
-		$this->PrestudentModel->addJoin(
-			'public.tbl_studentlehrverband v',
-			'v.student_uid=s.student_uid AND v.studiensemester_kurzbz' . ($studiensemester_kurzbz ? '=' . $stdsemEsc : ' IS NULL'),
-			$type
-		);
-		$this->PrestudentModel->addJoin('public.tbl_prestudentstatus ps', '
-			ps.status_kurzbz=public.get_rolle_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ') 
-			AND ps.prestudent_id=tbl_prestudent.prestudent_id 
-			AND ps.studiensemester_kurzbz=public.get_stdsem_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ') 
-			AND ps.ausbildungssemester=public.get_absem_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ')', 'LEFT');
-
-		if(defined('STV_TAGS_ENABLED') && STV_TAGS_ENABLED)
-		{
-			$this->PrestudentModel->addJoin($subQueryTag, 'tag_data_agg.prestudent_id = tbl_prestudent.prestudent_id', 'LEFT');
-		}
-
-
-		$this->PrestudentModel->addSelect("b.uid");
-		if(defined('STV_TAGS_ENABLED') && STV_TAGS_ENABLED)
-		{
-			$this->PrestudentModel->addSelect('tag_data_agg.tags');
-		}
-		$this->PrestudentModel->addSelect('titelpre');
-		$this->PrestudentModel->addSelect('nachname');
-		$this->PrestudentModel->addSelect('vorname');
-		$this->PrestudentModel->addSelect('wahlname');
-		$this->PrestudentModel->addSelect('vornamen');
-		$this->PrestudentModel->addSelect('titelpost');
-		$this->PrestudentModel->addSelect('ersatzkennzeichen');
-		$this->PrestudentModel->addSelect('gebdatum');
-		$this->PrestudentModel->addSelect('geschlecht');
-		$this->PrestudentModel->addSelect('foto');
-		$this->PrestudentModel->addSelect('foto_sperre');
-
-		// semester
-		// verband
-		// gruppe
-
-		//add status per semester
-		$this->PrestudentModel->addSelect(
-			"public.get_rolle_prestudent(public.tbl_prestudent.prestudent_id, "
-				. $this->PrestudentModel->escape($studiensemester_kurzbz)
-				. ")  AS statusofsemester"
-		);
-
-		$this->PrestudentModel->addSelect('UPPER(stg.typ || stg.kurzbz) AS studiengang');
-		$this->PrestudentModel->addSelect('tbl_prestudent.studiengang_kz');
-		$this->PrestudentModel->addSelect('stg.bezeichnung AS stg_bezeichnung');
-		$this->PrestudentModel->addSelect("s.matrikelnr");
-		$this->PrestudentModel->addSelect('p.person_id');
-		$this->PrestudentModel->addSelect('pls.status_kurzbz AS status');
-		$this->PrestudentModel->addSelect('pls.datum AS status_datum');
-		$this->PrestudentModel->addSelect('pls.bestaetigtam AS status_bestaetigung');
-		$this->PrestudentModel->addSelect("
-			CASE
-				WHEN pls.status_kurzbz = 'Interessent'
-				THEN pls.ausbildungssemester
-				ELSE s.semester
-			END AS semester_berechnet
-		");
-		$this->PrestudentModel->addSelect(
-			"(SELECT kontakt FROM public.tbl_kontakt WHERE kontakttyp='email' AND person_id=p.person_id AND zustellung LIMIT 1) AS mail_privat",
-			false
-		);
-		$this->PrestudentModel->addSelect("
-			CASE WHEN b.uid IS NOT NULL AND b.uid<>'' 
-			THEN CONCAT(b.uid, '@', " . $this->PrestudentModel->escape(DOMAIN) . ")
-			ELSE '' END AS mail_intern", false);
-		$this->PrestudentModel->addSelect('p.anmerkung AS anmerkungen');
-		$this->PrestudentModel->addSelect('tbl_prestudent.anmerkung');
-		$this->PrestudentModel->addSelect('pls.orgform_kurzbz');
-		$this->PrestudentModel->addSelect('aufmerksamdurch_kurzbz');
-		$this->PrestudentModel->addSelect(
-			"(SELECT rt_gesamtpunkte AS punkte FROM public.tbl_prestudent WHERE prestudent_id=ps.prestudent_id) AS punkte",
-			false
-		);
-		$this->PrestudentModel->addSelect('tbl_prestudent.aufnahmegruppe_kurzbz');
-		$this->PrestudentModel->addSelect('tbl_prestudent.dual');
-		$this->PrestudentModel->addSelect('p.matr_nr');
-		$this->PrestudentModel->addSelect('sp.bezeichnung AS studienplan_bezeichnung');
-		$this->PrestudentModel->addSelect('tbl_prestudent.prestudent_id');
-
-		// priorisierung_relativ
-
-		$this->PrestudentModel->addSelect('mentor');
-		$this->PrestudentModel->addSelect('b.aktiv AS bnaktiv');
-		$this->PrestudentModel->addSelect('unruly');
-
-		$this->PrestudentModel->db->where_in('tbl_prestudent.studiengang_kz', $this->allowedStgs);
-
-		$this->PrestudentModel->addOrder('nachname');
-		$this->PrestudentModel->addOrder('vorname');
-	}
-
-	/**
-	 * @return void
-	 */
-	protected function addSelectPrioRel()
-	{
-		$this->PrestudentModel->addSelect("(
-			SELECT count(*)
-			FROM (
-				SELECT *, public.get_rolle_prestudent(pss.prestudent_id, NULL) AS laststatus
-				FROM public.tbl_prestudent pss
-				JOIN public.tbl_prestudentstatus USING (prestudent_id)
-				WHERE person_id = p.person_id
-				AND studiensemester_kurzbz = (
-					SELECT studiensemester_kurzbz
-					FROM public.tbl_prestudentstatus
-					WHERE prestudent_id = tbl_prestudent.prestudent_id
-					AND status_kurzbz = 'Interessent'
-					LIMIT 1
-				)
-				AND status_kurzbz = 'Interessent'
-			) prest
-			WHERE laststatus NOT IN ('Abbrecher', 'Abgewiesener', 'Absolvent')
-			AND priorisierung <= tbl_prestudent.priorisierung
-		) || ' (' || COALESCE(tbl_prestudent.priorisierung::text, ' '::text) || ')' AS priorisierung_relativ", false);
-	}
-
 	/**
 	 * Adds additional filters to the query
 	 *
diff --git a/application/libraries/stv/StudentListLib.php b/application/libraries/stv/StudentListLib.php
new file mode 100644
index 000000000..b10539f53
--- /dev/null
+++ b/application/libraries/stv/StudentListLib.php
@@ -0,0 +1,370 @@
+<?php
+/**
+ * Copyright (C) 2025 fhcomplete.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+if (! defined('BASEPATH')) exit('No direct script access allowed');
+
+/**
+ * This generates a list of students and or prestudents used for Studierendenverwaltung
+ */
+class StudentListLib
+{
+	private $_ci; // Code igniter instance
+
+	private $_allowedStgs = [];
+	private $_selects = [];
+	private $_joins = [];
+	
+	/**
+	 * Gets the CI instance, loads model and prepares default values
+	 *
+	 * @param array		$params
+	 *
+	 * @return void
+	 */
+	public function __construct($params = null)
+	{
+		$this->_ci =& get_instance(); // get code igniter instance
+
+		$this->_ci->load->model('crm/Prestudent_model', 'PrestudentModel');
+
+		if (isset($params['allowedStgs']))
+			$this->_allowedStgs = $params['allowedStgs'];
+
+		// Add default SELECTs
+		$this->addSelect("b.uid");
+		if (defined('STV_TAGS_ENABLED') && STV_TAGS_ENABLED)
+			$this->addSelect('tag_data_agg.tags');
+		$this->addSelect('titelpre');
+		$this->addSelect('nachname');
+		$this->addSelect('vorname');
+		$this->addSelect('wahlname');
+		$this->addSelect('vornamen');
+		$this->addSelect('titelpost');
+		$this->addSelect('ersatzkennzeichen');
+		$this->addSelect('gebdatum');
+		$this->addSelect('geschlecht');
+		$this->addSelect('foto');
+		$this->addSelect('foto_sperre');
+		$this->addSelect('v.semester');
+		$this->addSelect('v.verband');
+		$this->addSelect('v.gruppe');
+		$this->addSelect("statusofsemester"); // Will be replaced later
+		$this->addSelect('UPPER(stg.typ || stg.kurzbz) AS studiengang');
+		$this->addSelect('tbl_prestudent.studiengang_kz');
+		$this->addSelect('stg.bezeichnung AS stg_bezeichnung');
+		$this->addSelect("s.matrikelnr");
+		$this->addSelect('p.person_id');
+		$this->addSelect('pls.status_kurzbz AS status');
+		$this->addSelect('pls.datum AS status_datum');
+		$this->addSelect('pls.bestaetigtam AS status_bestaetigung');
+		$this->addSelect("
+			CASE
+				WHEN pls.status_kurzbz = 'Interessent'
+				THEN pls.ausbildungssemester
+				ELSE s.semester
+			END AS semester_berechnet
+		");
+		$this->addSelect(
+			"(SELECT kontakt FROM public.tbl_kontakt WHERE kontakttyp='email' AND person_id=p.person_id AND zustellung LIMIT 1) AS mail_privat",
+			false
+		);
+		$this->addSelect("
+			CASE WHEN b.uid IS NOT NULL AND b.uid<>'' 
+			THEN CONCAT(b.uid, '@', " . $this->_ci->PrestudentModel->escape(DOMAIN) . ")
+			ELSE '' END AS mail_intern", false);
+		$this->addSelect('p.anmerkung AS anmerkungen');
+		$this->addSelect('tbl_prestudent.anmerkung');
+		$this->addSelect('pls.orgform_kurzbz');
+		$this->addSelect('aufmerksamdurch_kurzbz');
+		$this->addSelect(
+			"(SELECT rt_gesamtpunkte AS punkte FROM public.tbl_prestudent WHERE prestudent_id=ps.prestudent_id) AS punkte",
+			false
+		);
+		$this->addSelect('tbl_prestudent.aufnahmegruppe_kurzbz');
+		$this->addSelect('tbl_prestudent.dual');
+		$this->addSelect('p.matr_nr');
+		$this->addSelect('sp.bezeichnung AS studienplan_bezeichnung');
+		$this->addSelect('tbl_prestudent.prestudent_id');
+		$this->addSelect("(
+			SELECT count(*)
+			FROM (
+				SELECT *, public.get_rolle_prestudent(pss.prestudent_id, NULL) AS laststatus
+				FROM public.tbl_prestudent pss
+				JOIN public.tbl_prestudentstatus USING (prestudent_id)
+				WHERE person_id = p.person_id
+				AND studiensemester_kurzbz = (
+					SELECT studiensemester_kurzbz
+					FROM public.tbl_prestudentstatus
+					WHERE prestudent_id = tbl_prestudent.prestudent_id
+					AND status_kurzbz = 'Interessent'
+					LIMIT 1
+				)
+				AND status_kurzbz = 'Interessent'
+			) prest
+			WHERE laststatus NOT IN ('Abbrecher', 'Abgewiesener', 'Absolvent')
+			AND priorisierung <= tbl_prestudent.priorisierung
+		) || ' (' || COALESCE(tbl_prestudent.priorisierung::text, ' '::text) || ')' AS priorisierung_relativ", false); // TODO(chris): overwrite in fetchStudents
+		$this->addSelect('mentor');
+		$this->addSelect('b.aktiv AS bnaktiv');
+		$this->addSelect('unruly');
+		
+		// Add default JOINs
+		$this->addJoin('public.tbl_studiengang stg', 'studiengang_kz', 'LEFT');
+		$this->addJoin('public.tbl_person p', 'person_id');
+		$this->addJoin('public.tbl_student s', 'prestudent_id', 'LEFT'); // TODO(chris): overwrite in fetchStudents
+		$this->addJoin('public.tbl_prestudentstatus pls', '
+			pls.status_kurzbz=public.get_rolle_prestudent(tbl_prestudent.prestudent_id, NULL) 
+			AND pls.prestudent_id=tbl_prestudent.prestudent_id 
+			AND pls.studiensemester_kurzbz=public.get_stdsem_prestudent(tbl_prestudent.prestudent_id, NULL) 
+			AND pls.ausbildungssemester=public.get_absem_prestudent(tbl_prestudent.prestudent_id, NULL)', 'LEFT');
+		$this->addJoin('lehre.tbl_studienplan sp', 'studienplan_id', 'LEFT');
+		$this->addJoin('public.tbl_benutzer b', 's.student_uid=b.uid', 'LEFT');
+		$this->addJoin("v", "", ""); // Will be replaced later
+		$this->addJoin("ps", "", ""); // Will be replaced later
+		if (defined('STV_TAGS_ENABLED') && STV_TAGS_ENABLED) {
+			$this->_ci->load->config('stv');
+			$tags = $this->_ci->config->item('stv_prestudent_tags');
+
+			$whereTags = '';
+			if (is_array($tags) && !isEmptyArray($tags)) {
+				$tags = array_keys($tags);
+
+				foreach ($tags as $key => $tag) {
+					$tags[$key] = $this->_ci->PrestudentModel->escape($tag);
+				}
+				$whereTags = " AND nt.typ_kurzbz IN (" . implode(",", $tags) . ")";
+			}
+			$subQueryTag = "(
+				SELECT
+					tag.prestudent_id,
+					COALESCE(json_agg(tag ORDER BY tag.done), '[]'::json) AS tags
+				FROM (
+					SELECT DISTINCT ON (n.notiz_id)
+						n.notiz_id AS id,
+						nt.typ_kurzbz,
+						array_to_json(nt.bezeichnung_mehrsprachig)->>0 AS beschreibung,
+						n.text AS notiz,
+						nt.style,
+						n.erledigt AS done,
+						nz.prestudent_id
+					FROM public.tbl_notizzuordnung AS nz
+					JOIN public.tbl_notiz AS n ON nz.notiz_id = n.notiz_id
+					JOIN public.tbl_notiz_typ AS nt ON n.typ = nt.typ_kurzbz " . $whereTags . "
+				) AS tag
+				GROUP BY tag.prestudent_id
+			) AS tag_data_agg";
+
+			$this->addJoin($subQueryTag, 'tag_data_agg.prestudent_id = tbl_prestudent.prestudent_id', 'LEFT');
+		}
+	}
+
+	//------------------------------------------------------------------------------------------------------------------
+	// Public methods
+
+	/**
+	 * Adds a SELECT statement to the query.
+	 *
+	 * @param string|array	$select
+	 * @param boolean		$escape (optional)
+	 *
+	 * @return void
+	 */
+	public function addSelect($select, $escape = true)
+	{
+		if (is_array($select)) {
+			foreach ($select as $s)
+				$this->addSelect($s, $escape);
+			return;
+		}
+		$alias = $this->getAliasFromSelect($select);
+		$this->_selects[$alias] = [$select, $escape];
+	}
+
+	/**
+	 * Joins a table to the query.
+	 *
+	 * @param string		$table
+	 * @param string		$cond
+	 * @param string		$type (optional)
+	 * @param string		$position (optional)
+	 *
+	 * @return void
+	 */
+	public function addJoin($table, $cond, $type = '', $position = 'end')
+	{
+		$alias = $this->getAliasFromTable($table);
+
+		if ($position == 'end') {
+			return $this->_joins[$alias] = [$table, $cond, $type];
+		}
+
+		if ($position == 'start') {
+			return $this->_joins = [$alias => [$table, $cond, $type]] + $this->_joins;
+		}
+
+		if (substr($position, 0, 7) == 'before_') {
+			$ref = substr($position, 7);
+			$index = 0;
+		} elseif (substr($position, 0, 6) == 'after_') {
+			$ref = substr($position, 6);
+			$index = 1;
+		} else {
+			return $this->addJoin($table, $cond, $type);
+		}
+		if (!isset($this->_joins[$ref]))
+			return $this->addJoin($table, $cond, $type);
+
+		$key_indeces = array_flip(array_keys($this->_joins));
+		$index += $key_indeces[$ref];
+
+		if (!$index)
+			return $this->addJoin($table, $cond, $type, 'start');
+
+		$front_part = array_slice($this->_joins, 0, $index, true);
+		$back_part = array_slice($this->_joins, $index, null, true);
+
+		if (isset($front_part[$alias])) {
+			unset($front_part[$alias]);
+		}
+
+		$this->_joins = $front_part + [$alias => [$table, $cond, $type]] + $back_part;
+	}
+
+	/**
+	 * Adds a WHERE clause to the query.
+	 *
+	 * @param string|array	$key
+	 * @param string|array	$value
+	 * @param boolean		$escape
+	 *
+	 * @return void
+	 */
+	public function addWhere($key, $value = null, $escape = true)
+	{
+		if (!is_array($key) && is_array($value)) {
+			$this->_ci->PrestudentModel->db->where_in($key, $value, $escape);
+		} else {
+			$this->_ci->PrestudentModel->db->where($key, $value, $escape);
+		}
+	}
+
+	/**
+	 * Adds a OR WHERE clause to the query.
+	 *
+	 * @param string|array	$key
+	 * @param string|array	$value
+	 * @param boolean		$escape
+	 *
+	 * @return void
+	 */
+	public function addOrWhere($key, $value = null, $escape = true)
+	{
+		if (!is_array($key) && is_array($value)) {
+			$this->_ci->PrestudentModel->db->or_where_in($key, $value, $escape);
+		} else {
+			$this->_ci->PrestudentModel->db->or_where($key, $value, $escape);
+		}
+	}
+
+	/**
+	 * Generates the query and executes it.
+	 *
+	 * @param string|null	$studiensemester_kurzbz
+	 *
+	 * @return stdClass		result of the query
+	 */
+	public function execute($studiensemester_kurzbz)
+	{
+		$stdsemEsc = $studiensemester_kurzbz ? $this->_ci->PrestudentModel->escape($studiensemester_kurzbz) : 'NULL';
+
+
+		$this->addSelect(
+			"public.get_rolle_prestudent(
+				public.tbl_prestudent.prestudent_id, 
+				" . $this->_ci->PrestudentModel->escape($studiensemester_kurzbz) . "
+			)  AS statusofsemester"
+		);
+		$this->addJoin(
+			'public.tbl_studentlehrverband v',
+			'v.student_uid=s.student_uid AND v.studiensemester_kurzbz' . ($studiensemester_kurzbz ? '=' . $stdsemEsc : ' IS NULL'),
+			'LEFT'
+		);
+		$this->addJoin(
+			'public.tbl_prestudentstatus ps',
+			'ps.status_kurzbz=public.get_rolle_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ') 
+				AND ps.prestudent_id=tbl_prestudent.prestudent_id 
+				AND ps.studiensemester_kurzbz=public.get_stdsem_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ') 
+				AND ps.ausbildungssemester=public.get_absem_prestudent(tbl_prestudent.prestudent_id, ' . $stdsemEsc . ')
+			',
+			'LEFT'
+		);
+
+		$this->addWhere('tbl_prestudent.studiengang_kz', $this->_allowedStgs);
+
+		foreach ($this->_joins as $join)
+			$this->_ci->PrestudentModel->addJoin($join[0], $join[1], $join[2]);
+
+		foreach ($this->_selects as $select)
+			$this->_ci->PrestudentModel->addSelect($select[0], $select[1]);
+
+		$this->_ci->PrestudentModel->addOrder('nachname');
+		$this->_ci->PrestudentModel->addOrder('vorname');
+
+		return $this->_ci->PrestudentModel->load();
+	}
+
+
+	//------------------------------------------------------------------------------------------------------------------
+	// Protected methods
+
+	/**
+	 * Get alias of a table or select statement
+	 *
+	 * @param string		$select
+	 *
+	 * @return string
+	 */
+	final protected function getAliasFromSelect($select)
+	{
+		if (strpos($select, ' ') !== false) {
+			return trim(strrchr($select, ' '));
+		}
+
+		if (strpos($select, '.') !== false) {
+			return substr(strrchr($select, '.'), 1);
+		}
+
+		return $select;
+	}
+
+	/**
+	 * Get alias of a table or select statement
+	 *
+	 * @param string|array	$table
+	 *
+	 * @return string|array
+	 */
+	final protected function getAliasFromTable($table)
+	{
+		if (strpos($table, ' ') !== false) {
+			return trim(strrchr($table, ' '));
+		}
+
+		return $table;
+	}
+}
diff --git a/application/libraries/vertragsbestandteil/AbstractBestandteil.php b/application/libraries/vertragsbestandteil/AbstractBestandteil.php
index ccd05f5e2..4e1e8b9d0 100644
--- a/application/libraries/vertragsbestandteil/AbstractBestandteil.php
+++ b/application/libraries/vertragsbestandteil/AbstractBestandteil.php
@@ -40,7 +40,9 @@ abstract class AbstractBestandteil implements IValidation
 		
 		if( is_bool($new_value) && ($old_value !== $new_value) ) {
 			$this->modifiedcolumns[$columnname] = $columnname;
-		} else if($old_value != $new_value) {		
+		} else if(is_null($old_value) xor is_null($new_value)) {
+			$this->modifiedcolumns[$columnname] = $columnname;
+		} else if($old_value != $new_value) {
 			$this->modifiedcolumns[$columnname] = $columnname;
 		}
 	}
diff --git a/application/libraries/vertragsbestandteil/VertragsbestandteilLohnguide.php b/application/libraries/vertragsbestandteil/VertragsbestandteilLohnguide.php
index 0e071f36b..71104fa91 100644
--- a/application/libraries/vertragsbestandteil/VertragsbestandteilLohnguide.php
+++ b/application/libraries/vertragsbestandteil/VertragsbestandteilLohnguide.php
@@ -137,19 +137,25 @@ EOTXT;
 		return parent::__toString() . $txt;
 	}
 
-	/* public function validate()
+	public function validate()
 	{
-		if( !(filter_var($this->tage, FILTER_VALIDATE_INT, 
-				array(
-					'options' => array(
-						'min_range' => 1,
-						'max_range' => 50
-					)
-				)
-			)) ) {
-			$this->validationerrors[] = 'Urlaubsanspruch muss eine Tagesanzahl im Bereich 1 bis 50 sein.';
+		$value = $this->vordienstzeit;
+
+		if ($value === null || $value === '') {
+			$result = null;   // allow null value 
+		} else {
+			$result = filter_var($value, FILTER_VALIDATE_INT, [
+				'options' => [
+					'min_range' => 0,
+					'max_range' => 100
+				]
+			]);
+
+			if ($result === false) {				
+				$this->validationerrors[] = 'Vordienstjahre muss eine ganze Zahl (0 bis 100) enthalten oder leer sein.';
+			}
 		}
 		
 		return parent::validate();
-	} */
+	} 
 }
diff --git a/application/views/system/infocenter/infocenterData.php b/application/views/system/infocenter/infocenterData.php
index ebfd1db37..d1ce87422 100644
--- a/application/views/system/infocenter/infocenterData.php
+++ b/application/views/system/infocenter/infocenterData.php
@@ -315,22 +315,15 @@
 				 WHERE tpl.app = '.$APP.'
 			) pl USING(person_id)
 	LEFT JOIN (
-				SELECT
+				SELECT DISTINCT ON (tbl_rueckstellung.person_id)
 					tbl_rueckstellung.person_id,
 					tbl_rueckstellung.datum_bis,
 					tbl_rueckstellung.status_kurzbz,
 					array_to_json(bezeichnung_mehrsprachig::varchar[])->>0 as bezeichnung
 				FROM public.tbl_rueckstellung
 				JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
-				JOIN public.tbl_person sp ON tbl_rueckstellung.person_id = sp.person_id
-				WHERE tbl_rueckstellung.rueckstellung_id =
-				(
-					SELECT srueck.rueckstellung_id
-					FROM public.tbl_rueckstellung srueck
-					WHERE srueck.person_id = tbl_rueckstellung.person_id
-						AND datum_bis >= NOW()
-					ORDER BY srueck.datum_bis DESC LIMIT 1
-				)
+				WHERE tbl_rueckstellung.datum_bis >= NOW()
+				ORDER BY tbl_rueckstellung.person_id, tbl_rueckstellung.datum_bis DESC
 			) rueck ON rueck.person_id = p.person_id
 		 WHERE
 			EXISTS (
diff --git a/application/views/system/infocenter/onboardingData.php b/application/views/system/infocenter/onboardingData.php
index 5ee66fdde..bf126f283 100644
--- a/application/views/system/infocenter/onboardingData.php
+++ b/application/views/system/infocenter/onboardingData.php
@@ -24,22 +24,15 @@ $query = '
 					 WHERE tpl.app = '.$APP.'
 				 ) pl ON p.person_id = pl.person_id
 			LEFT JOIN (
-				SELECT
+					SELECT DISTINCT ON (tbl_rueckstellung.person_id)
 					tbl_rueckstellung.person_id,
 					tbl_rueckstellung.datum_bis,
 					tbl_rueckstellung.status_kurzbz,
 					array_to_json(bezeichnung_mehrsprachig::varchar[])->>0 as bezeichnung
 				FROM public.tbl_rueckstellung
-					JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
-					JOIN public.tbl_person sp ON tbl_rueckstellung.person_id = sp.person_id
-				WHERE tbl_rueckstellung.rueckstellung_id =
-				(
-					SELECT srueck.rueckstellung_id
-					FROM public.tbl_rueckstellung srueck
-					WHERE srueck.person_id = tbl_rueckstellung.person_id
-						AND datum_bis >= NOW()
-					ORDER BY srueck.datum_bis DESC LIMIT 1
-				)
+				JOIN public.tbl_rueckstellung_status USING(status_kurzbz)
+				WHERE tbl_rueckstellung.datum_bis >= NOW()
+				ORDER BY tbl_rueckstellung.person_id, tbl_rueckstellung.datum_bis DESC
 			) rueck ON rueck.person_id = p.person_id
 		WHERE p.person_id NOT IN (SELECT person_id FROM public.tbl_prestudent)';
 
diff --git a/cis/testtool/frage.php b/cis/testtool/frage.php
index a5f4100c9..5a5aaaa18 100644
--- a/cis/testtool/frage.php
+++ b/cis/testtool/frage.php
@@ -80,9 +80,17 @@ echo '
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 	<meta http-equiv="Content-Type" content="text/xhtml; charset=UTF-8" />
+	<link rel="stylesheet" href="../../vendor/components/jqueryui/themes/base/jquery-ui.min.css" type="text/css" />
 	<link rel="stylesheet" href="../../vendor/twbs/bootstrap3/dist/css/bootstrap.min.css" type="text/css"/>
 	<link href="../../skin/style.css.php" rel="stylesheet" type="text/css" />
+	<style>
+		.ui-dialog-titlebar-close
+		{
+			visibility: hidden !important;
+		}
+	</style>
 	<script type="text/javascript" src="../../vendor/components/jquery/jquery.min.js"></script>
+	<script type="text/javascript" src="../../vendor/components/jqueryui/jquery-ui.min.js"></script>
 	<script type="text/javascript" src="../../vendor/twbs/bootstrap3/dist/js/bootstrap.min.js"></script>
 	<script language="Javascript" type="text/javascript">
 	//<![CDATA[
@@ -131,22 +139,78 @@ echo '
 		}
 	}
 
-	function GebietStarten(bezeichnung,stunde,minute,sekunde,gebiet_id)
+	function GebietStarten(bezeichnung, stunde, minute, sekunde, gebiet_id)
 	{
-		var check = confirm(<?php echo "'".$p->t('testtool/okKlickenUmZuStarten')."'"?>+' '+stunde+'h '+minute+'m '+sekunde+'s');
-		if (check == true) {
-			var sprache_user = <?php echo "'".$sprache_user."'"?>;
-			document.location.href = 'frage.php?gebiet_id='+gebiet_id+'&start=true';
-		}
-		else {
-			return false;
+		let message = <?php echo "'".$p->t('testtool/okKlickenUmZuStarten')."'"?> + ' ' + stunde + 'h ' + minute + 'm ' + sekunde + 's';
+		let title = <?php echo "'".$p->t('testtool/startGebiet')."'"?>;
+		let abbrechen = <?php echo "'".$p->t('testtool/abbrechen')."'"?>;
+
+		if ($('#gebiet-dialog').length === 0)
+		{
+			$('body').append(
+				'<div id="gebiet-dialog" title="' + title + '">' +
+					'<p id="gebiet-dialog-msg">' + message + '</p>' +
+				'</div>'
+			);
 		}
+
+		$('#gebiet-dialog').dialog({
+			modal: true,
+			width: 400,
+			resizable: false,
+			buttons: [
+				{
+					text: 'OK',
+					click: function() {
+						$(this).dialog('close');
+						document.location.href = 'frage.php?gebiet_id=' + gebiet_id + '&start=true';
+					}
+				},
+				{
+					text: abbrechen,
+					click: function() {
+						$(this).dialog('close');
+					}
+				}
+			]
+		});
 	}
 
+	let letzteFrageBestaetigt = false;
+
 	function letzteFrage()
 	{
-		alert(<?php echo "'".$p->t("testtool/alleFragenBeantwortet")."'"?>);
-		return true;
+		if (letzteFrageBestaetigt)
+			return true;
+
+		let message = <?php echo "'".$p->t("testtool/alleFragenBeantwortet")."'"?>;
+
+		if ($('#fertig-dialog').length === 0)
+		{
+			$('body').append(
+				'<div id="fertig-dialog">' +
+					'<p>' + message + '</p>' +
+				'</div>'
+			);
+		}
+
+		$('#fertig-dialog').dialog({
+			modal: true,
+			width: 400,
+			resizable: false,
+			buttons: [
+				{
+					text: 'OK',
+					click: function() {
+						$(this).dialog('close');
+						letzteFrageBestaetigt = true;
+						$('[name="submitantwort"]').click();
+					}
+				}
+			]
+		});
+
+		return false;
 	}
 
 	$(document).ready(function () {
@@ -647,7 +711,7 @@ if($frage->frage_id!='')
 	}
 
 	$letzte = $frage->getNextFrage($gebiet_id, $_SESSION['pruefling_id'], $frage_id, $demo);
-	echo "<form action=\"$PHP_SELF?gebiet_id=$gebiet_id&amp;frage_id=$frage->frage_id\" method=\"POST\" ".(!$letzte && !$levelgebiet?"onsubmit=\"letzteFrage()\"":"").">";
+	echo "<form action=\"$PHP_SELF?gebiet_id=$gebiet_id&amp;frage_id=$frage->frage_id\" method=\"POST\" ".(!$letzte && !$levelgebiet?"onsubmit=\"return letzteFrage()\"":"").">";
 	echo '
 		<div class="row text-center">
 			<table class="table" style="width: 600px; margin-left: auto; margin-right: auto;">
diff --git a/cis/testtool/gebietfertig.php b/cis/testtool/gebietfertig.php
index cf0a86ae2..327848b17 100644
--- a/cis/testtool/gebietfertig.php
+++ b/cis/testtool/gebietfertig.php
@@ -44,6 +44,27 @@ if (isset($_GET['sprache_user']) && !empty($_GET['sprache_user']))
 $sprache_user = (isset($_SESSION['sprache_user']) && !empty($_SESSION['sprache_user'])) ? $_SESSION['sprache_user'] : DEFAULT_LANGUAGE;
 $p = new phrasen($sprache_user);
 
+$showInfo = false;
+if (isset($_SESSION['alleGebiete']))
+{
+	$alleGebiete = array_map('intval', $_SESSION['alleGebiete']);
+	$pruefling_id = $_SESSION['pruefling_id'];
+
+	$qry = "SELECT COUNT(DISTINCT gebiet_id)  as anzahl
+			FROM testtool.tbl_pruefling_frage
+			JOIN testtool.tbl_frage USING(frage_id)
+			WHERE gebiet_id IN (". implode(',', $alleGebiete) .")
+			AND pruefling_id = ". $pruefling_id ."
+	";
+
+	$result = $db->db_query($qry);
+	$anzahlGebiete = $db->db_fetch_object($result);
+
+
+	if ((int)$anzahlGebiete->anzahl === count($alleGebiete))
+		$showInfo = true;
+}
+
 ?>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
@@ -69,6 +90,7 @@ $p = new phrasen($sprache_user);
 <body>
 <br><br><br><br><br>
 <center><h2><?php echo $p->t('testtool/zeitAbgelaufen');?></h2>
+	<h3><?php echo ($showInfo ? ($p->t('testtool/alleGebietGestartet') . "<br />" . $p->t('testtool/alleGebieteGestartetInfo')) : ''); ?></h3>
 </center>
 </body>
 </html>
diff --git a/cis/testtool/login.php b/cis/testtool/login.php
index cfc1ba63b..60447ee52 100644
--- a/cis/testtool/login.php
+++ b/cis/testtool/login.php
@@ -142,7 +142,9 @@ if (isset($_REQUEST['prestudent']))
 		}
 		if ($reihungstest_id != '' && $rt->load($reihungstest_id))
 		{
-			if ($rt->freigeschaltet)
+			$pruefling_exist = new Pruefling();
+			$alreadyInRT = $pruefling_exist->personAlreadyInRT($ps->person_id, $rt->reihungstest_id, $ps->prestudent_id);
+			if ($rt->freigeschaltet && !$alreadyInRT)
 			{
 				// regenerate Session ID after Login
 				session_regenerate_id();
@@ -282,7 +284,14 @@ if (isset($_REQUEST['prestudent']))
 			}
 			else
 			{
-				$alertmsg .= '<div class="alert alert-danger">'.$p->t('testtool/reihungstestNichtFreigeschalten').'</div>';
+				if ($alreadyInRT)
+				{
+					$alertmsg .= '<div class="alert alert-danger">'.$p->t('testtool/reihungstestNichtRegistriert').'</div>';
+				}
+				else
+				{
+					$alertmsg .= '<div class="alert alert-danger">'.$p->t('testtool/reihungstestNichtFreigeschalten').'</div>';
+				}
 			}
 		}
 		else
diff --git a/cis/testtool/menu.php b/cis/testtool/menu.php
index 494f05567..fb28825de 100644
--- a/cis/testtool/menu.php
+++ b/cis/testtool/menu.php
@@ -187,6 +187,7 @@ else if (isset($_SESSION['pruefling_id']))
 			}
 
 			$qry .= "
+				AND ps_status.bewerbung_abgeschicktamum IS NOT NULL
 
 		/* Order to get last semester when using distinct on */
 		ORDER BY
@@ -405,6 +406,29 @@ else if (isset($_SESSION['pruefling_id']))
 		echo '</table>';
 	}
 
+	if (isset($_SESSION['pruefling_id']) && !empty($_SESSION['alleGebiete']))
+	{
+		$alleGebiete = array_map('intval', $_SESSION['alleGebiete']);
+		$pruefling_id = (int)$_SESSION['pruefling_id'];
+
+		$qry = "SELECT COUNT(DISTINCT gebiet_id) AS anzahl
+				FROM testtool.tbl_pruefling_frage
+					JOIN testtool.tbl_frage USING(frage_id)
+				WHERE gebiet_id IN (". implode(',', $alleGebiete) .")
+					AND pruefling_id = ". $pruefling_id;
+
+		$result_check = $db->db_query($qry);
+		$row_check = $db->db_fetch_object($result_check);
+
+		if ((int)$row_check->anzahl === count($alleGebiete))
+		{
+			echo '<tr><td>
+					<div class="alert alert-success small" style="margin-left: 20px; width: 170px; margin-top: 3px;" role="alert">
+						<strong>'.$p->t('testtool/alleGebietGestartet').'</strong>
+					</div>
+				</td></tr>';
+		}
+	}
 	// Link zum Logout
 
 	echo '<tr><td class="ItemTesttool" style="margin-left: 20px;" nowrap>
diff --git a/include/pruefling.class.php b/include/pruefling.class.php
index efe660ca9..698624c73 100644
--- a/include/pruefling.class.php
+++ b/include/pruefling.class.php
@@ -584,6 +584,32 @@ class pruefling extends basis_db
 		
 		$qry .= " LIMIT 1";
 
+		if($result = $this->db_query($qry))
+		{
+			if ($this->db_num_rows($result) == 0)
+				return false;
+			else
+				return true;
+		}
+		else
+		{
+			$this->errormsg = 'Fehler bei einer Abfrage';
+			return false;
+		}
+	}
+	public function personAlreadyInRT($person_id, $reihungstest_id, $prestudent_id)
+	{
+		$qry = "SELECT tbl_prestudent.prestudent_id
+				FROM public.tbl_rt_person
+					JOIN public.tbl_prestudent ON tbl_prestudent.person_id = tbl_rt_person.person_id
+					JOIN public.tbl_prestudentstatus ON tbl_prestudent.prestudent_id = tbl_prestudentstatus.prestudent_id AND status_kurzbz = 'Bewerber'
+						AND tbl_prestudentstatus.studienplan_id = tbl_rt_person.studienplan_id
+				WHERE tbl_rt_person.person_id = " . $this->db_add_param($person_id) . "
+					AND tbl_rt_person.rt_id = " . $this->db_add_param($reihungstest_id) . "
+					AND tbl_prestudent.prestudent_id != " . $this->db_add_param($prestudent_id) . "
+					AND get_rolle_prestudent(tbl_prestudent.prestudent_id, NULL) = 'Bewerber'
+				LIMIT 1";
+
 		if($result = $this->db_query($qry))
 		{
 			if ($this->db_num_rows($result) == 0)
diff --git a/locale/de-AT/testtool.php b/locale/de-AT/testtool.php
index 33c46b0a7..9f45e251f 100644
--- a/locale/de-AT/testtool.php
+++ b/locale/de-AT/testtool.php
@@ -17,6 +17,7 @@ $this->phrasen['testtool/basic']='Basic';
 $this->phrasen['testtool/basisgebiete']='Basisgebiete';
 $this->phrasen['testtool/semester']='Semester';
 $this->phrasen['testtool/reihungstestNichtFreigeschalten']='Der zuteilte Reihungstest ist noch nicht freigeschaltet';
+$this->phrasen['testtool/reihungstestNichtRegistriert']='Sie sind für den Reihungstest nicht registriert';
 $this->phrasen['testtool/reihungstestKannNichtGeladenWerden']='Der Reihungstest dem Sie zugeteilt sind, kann nicht geladen werden. Melden Sie sich bitte bei der Reihungstestaufsicht.';
 $this->phrasen['testtool/geburtsdatumStimmtNichtUeberein']='Ihr Geburtsdatum stimmt nicht mit unseren Daten überein. Bitte wenden Sie sich an die Aufsichtsperson';
 $this->phrasen['testtool/home']='Home';
@@ -31,10 +32,14 @@ $this->phrasen['testtool/keineAntwort']='Keine Antwort';
 $this->phrasen['testtool/speichernUndWeiter']='Speichern und weiter';
 $this->phrasen['testtool/alleFragenBeantwortet']='GLÜCKWUNSCH! \n\nSie haben alle Fragen in der zur Verfügung stehenden Zeit beantwortet. \nNutzen Sie die verbleibende Zeit, um Ihre Antworten zu kontrollieren oder fahren Sie mit dem nächsten Teilgebiet fort.';
 $this->phrasen['testtool/zeitAbgelaufen']='Die Maximalzeit für dieses Gebiet ist abgelaufen, oder alle Fragen wurden beantwortet';
+$this->phrasen['testtool/alleGebietGestartet']='Sie haben alle Gebiete bearbeitet.';
+$this->phrasen['testtool/alleGebieteGestartetInfo']='Sie können sich nun ausloggen und den Browser schließen.';
 $this->phrasen['testtool/spracheDerTestfragen']='Gewünschte Sprache der Testfragen';
 $this->phrasen['testtool/einleitung']='Einleitung';
 $this->phrasen['testtool/blaettern']='Blättern';
 $this->phrasen['testtool/demo']='Demobeispiel ansehen';
+$this->phrasen['testtool/abbrechen']='Abbrechen';
+$this->phrasen['testtool/startGebiet']='Gebiet starten';
 $this->phrasen['testtool/okKlickenUmZuStarten']='Klicken Sie OK um dieses Gebiet zu starten. \nSie haben für die Bearbeitung ein Zeitlimit von';
 $this->phrasen['testtool/bitteZuerstAnmelden']='Bitte zuerst anmelden!';
 $this->phrasen['testtool/fehlerBeimGenerierenDesFragenpools']='Fehler beim generieren des Fragenpools';
diff --git a/locale/en-US/testtool.php b/locale/en-US/testtool.php
index 260b5ceea..24dfac2db 100644
--- a/locale/en-US/testtool.php
+++ b/locale/en-US/testtool.php
@@ -17,6 +17,7 @@ $this->phrasen['testtool/basic']='Basic';
 $this->phrasen['testtool/basisgebiete']='Basic test';
 $this->phrasen['testtool/semester']='Semester';
 $this->phrasen['testtool/reihungstestNichtFreigeschalten']='The entrance examination assigned has not yet been activated.';
+$this->phrasen['testtool/reihungstestNichtRegistriert']='You are not registered for the placement test.';
 $this->phrasen['testtool/reihungstestKannNichtGeladenWerden']='The placement test you are assigned to could not be loaded. Please contact the placement test supervisior.';
 $this->phrasen['testtool/geburtsdatumStimmtNichtUeberein']='Your date of birth does not correspond to the data we have. Please speak to the supervisor. ';
 $this->phrasen['testtool/home']='Home';
@@ -31,10 +32,14 @@ $this->phrasen['testtool/keineAntwort']='No Answer';
 $this->phrasen['testtool/speichernUndWeiter']='Save and next';
 $this->phrasen['testtool/alleFragenBeantwortet']='CONGRATULATIONS!\n\nYou have answered all the questions in the time allowed.\n Use the remaining time to check your answers or continue to the next section.';
 $this->phrasen['testtool/zeitAbgelaufen']='The time for this part has expired or you have answered all the questions.';
+$this->phrasen['testtool/alleGebietGestartet']='You have worked on all sections.';
+$this->phrasen['testtool/alleGebieteGestartetInfo']='You can now log out and close the browser.';
 $this->phrasen['testtool/spracheDerTestfragen']='Desired language of questions';
 $this->phrasen['testtool/einleitung']='Introduction';
 $this->phrasen['testtool/blaettern']='Browse';
 $this->phrasen['testtool/demo']='See an example';
+$this->phrasen['testtool/abbrechen']='Cancel';
+$this->phrasen['testtool/startGebiet']='Start the section';
 $this->phrasen['testtool/okKlickenUmZuStarten']='Click OK to start this section. \nYou have a timelimit of';
 $this->phrasen['testtool/bitteZuerstAnmelden']='Please log in first!';
 $this->phrasen['testtool/fehlerBeimGenerierenDesFragenpools']='Error in generating the pool of questions.';
diff --git a/rdf/diplomasupplement.xml.php b/rdf/diplomasupplement.xml.php
index d5eb11c26..4b30b8691 100644
--- a/rdf/diplomasupplement.xml.php
+++ b/rdf/diplomasupplement.xml.php
@@ -705,7 +705,72 @@ if (isset($_REQUEST["xmlformat"]) && $_REQUEST["xmlformat"] == "xml")
 		}
 		echo ' </anrechnungen>';
 
+		//Berufliche Kompetenzen
+		$studienplan = new studienplan();
+		$studienplan->loadStudienplan($studienplan_id);
+		$regelstudiendauer = $studienplan->regelstudiendauer;
+		$studienplan_ects = $studienplan->ects_stpl;
+		$ects_berufliche_kompetenzen = 0;
+
+		//bei masterlehrgängen und $studienplan_ects >= 120 ECTS: Andruck der beruflichen Kompetenzen, wenn die Lv angerechnet wurde
+		//TODO(Manu) check if rule still valid
+		if ($row->typ == 'l' && $regelstudiendauer >= 4)
+		{
+			$ects_berufliche_kompetenzen = 0;
+			echo '<berufliche_kompetenzen>';
+			echo '<header_berufliche_kompetenz>Validierung von beruflich erworbenen Kompetenzen</header_berufliche_kompetenz>';
+
+			$qry_sem_0="
+				SELECT
+					lehrveranstaltung_id,
+					lehrform_kurzbz,
+					sws,
+					lehre.tbl_lehrveranstaltung.bezeichnung,
+					bezeichnung_english,
+					ects,
+					benotungsdatum,
+					note,
+					positiv,
+					offiziell,
+					note.anmerkung
+				FROM
+					lehre.tbl_zeugnisnote zeugnis
+					JOIN lehre.tbl_note note USING(note)
+					JOIN lehre.tbl_lehrveranstaltung USING(lehrveranstaltung_id)
+					JOIN public.tbl_student student USING(student_uid)
+				WHERE
+				    student_uid =".$db->db_add_param($uid_arr[$i])."
+				AND
+					lehre.tbl_lehrveranstaltung.semester = '0'
+					";
+
+			if($result_sem_0 = $db->db_query($qry_sem_0))
+			{
+				while ($row_sem_0 = $db->db_fetch_object($result_sem_0))
+				{
+					$benotungsdatum = $datum->formatDatum($row_sem_0->benotungsdatum, 'd/m/Y');
+					$note = $db->db_parse_bool($row_sem_0->offiziell) ?  $row_sem_0->anmerkung : $row_sem_0->note;
+					$ects_berufliche_kompetenzen += $row_sem_0->ects;
+
+					echo '<lv_sem0>
+						<lv_id>' . $row_sem_0->lehrveranstaltung_id . '</lv_id>
+						<lehrform_kurzbz>' . $row_sem_0->lehrform_kurzbz . '</lehrform_kurzbz>
+						<bezeichnung><![CDATA[' . $row_sem_0->bezeichnung . ']]></bezeichnung>
+						<bezeichnung_englisch><![CDATA[' . $row_sem_0->bezeichnung_english . ']]></bezeichnung_englisch>
+						<sws_lv>'.$row_sem_0->sws.'</sws_lv>
+						<ects>'.$row_sem_0->ects.'</ects>
+						<note_positiv>'.$db->db_parse_bool($row_sem_0->positiv).'</note_positiv>
+						<note>'.$note.'</note>
+						<benotungsdatum>'.$benotungsdatum.'</benotungsdatum>
+						</lv_sem0>';
+				}
+			}
+			echo '<ects_berufliche_kompetenz>'.$ects_berufliche_kompetenzen.'</ects_berufliche_kompetenz>';
+			echo '</berufliche_kompetenzen>';
+		}
+
 		echo "<studiensemester>";
+
 		for($start = $semesterNumberStart; $start <= $semesterNumberEnd; $start++)
 		{
 			$semester_ects = 0;
@@ -728,6 +793,7 @@ if (isset($_REQUEST["xmlformat"]) && $_REQUEST["xmlformat"] == "xml")
 				AND zeugnis = true
 				AND status.ausbildungssemester = ".$db->db_add_param($start)."
 				AND status.status_kurzbz NOT IN('Unterbrecher', 'Interessent','Bewerber','Aufgenommener','Abgewiesener','Wartender')
+				--AND	lehre.tbl_lehrveranstaltung.semester != '0'
 			ORDER BY datum ASC";
 
 			$semester_kurzbz = array();
@@ -776,6 +842,7 @@ if (isset($_REQUEST["xmlformat"]) && $_REQUEST["xmlformat"] == "xml")
 			WHERE
 				student_uid = ".$db->db_add_param($uid_arr[$i])."
 				AND zeugnis = true
+				AND	lehre.tbl_lehrveranstaltung.semester != '0'
 				AND studiensemester_kurzbz in (".$sqlStudent->implode4SQL($aktuellesSemester).")";
 
 			if (defined('ZEUGNISNOTE_NICHT_ANZEIGEN'))
@@ -1134,10 +1201,19 @@ if (isset($_REQUEST["xmlformat"]) && $_REQUEST["xmlformat"] == "xml")
 					}
 				}
 			}
+
 			echo '<ects_gesamt>'.$semester_ects.'</ects_gesamt>';
 			echo '<ects_gesamt_positiv>'.$semester_ects_positiv.'</ects_gesamt_positiv>';
 			echo "</semesters>";
 		}
+
+		//TODO(Manu) check if rule still valid
+		if ($row->typ == 'l' && $regelstudiendauer >= 4)
+		{
+			$ects_total += $ects_berufliche_kompetenzen;
+			$ects_total_positiv += $ects_berufliche_kompetenzen;
+		}
+
 		echo "</studiensemester>";
 		echo " <ects_total>$ects_total</ects_total>";
 		echo " <ects_total_positiv>$ects_total_positiv</ects_total_positiv>";
diff --git a/system/dbupdate_3.4.php b/system/dbupdate_3.4.php
index 8b6af9f2d..d43f1f3d3 100644
--- a/system/dbupdate_3.4.php
+++ b/system/dbupdate_3.4.php
@@ -94,6 +94,7 @@ require_once('dbupdate_3.4/71399_dashboard_update_widget_paths.php');
 require_once('dbupdate_3.4/71645_studvw_messagetab_ladezeit.php');
 require_once('dbupdate_3.4/71566_studienordnungsdokument_neuer_organisationseinheitstyp_programm.php');
 require_once('dbupdate_3.4/70376_lohnguide.php');
+require_once('dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php');
 
 // *** Pruefung und hinzufuegen der neuen Attribute und Tabellen
 echo '<H2>Pruefe Tabellen und Attribute!</H2>';
diff --git a/system/dbupdate_3.4/70376_lohnguide.php b/system/dbupdate_3.4/70376_lohnguide.php
index 6cf2be38e..b5e9fcce2 100644
--- a/system/dbupdate_3.4/70376_lohnguide.php
+++ b/system/dbupdate_3.4/70376_lohnguide.php
@@ -264,8 +264,8 @@ CREATE TABLE IF NOT EXISTS hr.tbl_vertragsbestandteil_lohnguide (
     stellenbezeichnung varchar(255),
     fachrichtung_kurzbz character varying(32) NOT NULL,
     modellstelle_kurzbz character varying(32) NOT NULL,
-    kommentar_person varchar(255),
-    kommentar_modellstelle varchar(255),
+    kommentar_person text,
+    kommentar_modellstelle text,
     CONSTRAINT tbl_vertragsbestandteil_lohnguide_pk PRIMARY KEY (vertragsbestandteil_id),
 	CONSTRAINT tbl_vertragsbestandteil_fk FOREIGN KEY (vertragsbestandteil_id) REFERENCES hr.tbl_vertragsbestandteil (vertragsbestandteil_id) MATCH FULL ON DELETE RESTRICT ON UPDATE CASCADE,
 	CONSTRAINT tbl_vertragsbestandteil_lohnguide_fachrichtung_fk FOREIGN KEY (fachrichtung_kurzbz) REFERENCES hr.tbl_lohnguide_fachrichtung (fachrichtung_kurzbz) MATCH FULL ON DELETE RESTRICT ON UPDATE CASCADE,
diff --git a/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php b/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php
new file mode 100644
index 000000000..97c44d57d
--- /dev/null
+++ b/system/dbupdate_3.4/75888_reihungstest_mehrfachdurchfuehrung.php
@@ -0,0 +1,15 @@
+<?php
+if (! defined('DB_NAME')) exit('No direct script access allowed');
+
+if ($result = $db->db_query("SELECT * FROM pg_class WHERE relname='idx_tbl_benutzerfunktion_uid'"))
+{
+	if ($db->db_num_rows($result) == 0)
+	{
+		$qry = "CREATE INDEX idx_tbl_benutzerfunktion_uid ON public.tbl_benutzerfunktion USING btree (uid)";
+
+		if (! $db->db_query($qry))
+			echo '<strong>idx_tbl_benutzerfunktion_uid: ' . $db->db_last_error() . '</strong><br>';
+		else
+			echo 'Index idx_tbl_benutzerfunktion_uid angelegt<br>';
+	}
+}