diff --git a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
index d2e21d8a6..207f1dc02 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
@@ -1553,4 +1553,183 @@ class DelegationTest extends TestCase
         $result = Delegation::countSelfService($user->USR_UID);
         $this->assertEquals(25, $result);
     }
+
+    /**
+     * This check if return the USR_UID assigned in the thread OPEN
+     *
+     * @covers Delegation::getCurrentUser
+     * @test
+     */
+    public function it_should_return_current_user_for_thread_open()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create user
+        $user = factory(User::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'OPEN',
+            'DEL_INDEX' => 2,
+            'USR_UID' => $user->USR_UID,
+        ]);
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'CLOSED',
+            'DEL_INDEX' => 1,
+            'USR_UID' => $user->USR_UID,
+        ]);
+
+        //Get the current user assigned in the open thread
+        $result = Delegation::getCurrentUser($application->APP_NUMBER, 2, 'OPEN');
+        $this->assertEquals($user->USR_UID, $result);
+    }
+
+    /**
+     * This check if return the USR_UID assigned in the thread CLOSED
+     *
+     * @covers Delegation::getCurrentUser
+     * @test
+     */
+    public function it_should_return_current_user_for_thread_closed()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create user
+        $user = factory(User::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'CLOSED',
+            'DEL_INDEX' => 1,
+            'USR_UID' => $user->USR_UID,
+        ]);
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'OPEN',
+            'DEL_INDEX' => 2,
+            'USR_UID' => $user->USR_UID,
+        ]);
+
+        //Get the current user assigned in the open thread
+        $result = Delegation::getCurrentUser($application->APP_NUMBER, 1, 'CLOSED');
+        $this->assertEquals($user->USR_UID, $result);
+    }
+
+    /**
+     * This check if return empty when the data does not exits
+     *
+     * @covers Delegation::getCurrentUser
+     * @test
+     */
+    public function it_should_return_empty_when_row_does_not_exist()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create user
+        $user = factory(User::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'CLOSED',
+            'DEL_INDEX' => 1,
+            'USR_UID' => $user->USR_UID,
+        ]);
+        factory(Delegation::class)->create([
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'DEL_THREAD_STATUS' => 'OPEN',
+            'DEL_INDEX' => 2,
+            'USR_UID' => $user->USR_UID,
+        ]);
+
+        //Get the current user assigned in the open thread
+        $result = Delegation::getCurrentUser($application->APP_NUMBER, 3, 'CLOSED');
+        $this->assertEmpty($result);
+
+        $result = Delegation::getCurrentUser($application->APP_NUMBER, 3, 'OPEN');
+        $this->assertEmpty($result);
+    }
+
+    /**
+     * This checks if return the open thread
+     *
+     * @covers Delegation::getOpenThreads
+     * @test
+     */
+    public function it_should_return_thread_open()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create user
+        $user = factory(User::class)->create();
+        //Create task
+        $task = factory(Task::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'DEL_THREAD_STATUS' => 'OPEN',
+            'DEL_FINISH_DATE' => null,
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'TAS_UID' => $task->TAS_UID,
+        ]);
+        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $this->assertEquals($application->APP_NUMBER, $result['APP_NUMBER']);
+    }
+
+    /**
+     * This checks if return empty when the thread is CLOSED
+     *
+     * @covers Delegation::getOpenThreads
+     * @test
+     */
+    public function it_should_return_empty_when_thread_is_closed()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create task
+        $task = factory(Task::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'DEL_THREAD_STATUS' => 'CLOSED',
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'TAS_UID' => $task->TAS_UID,
+        ]);
+        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $this->assertEmpty($result);
+    }
+
+    /**
+     * This checks if return empty when the data is not null
+     *
+     * @covers Delegation::getOpenThreads
+     * @test
+     */
+    public function it_should_return_empty_when_thread_finish_date_is_not_null()
+    {
+        //Create process
+        $process = factory(Process::class)->create();
+        //Create a case
+        $application = factory(Application::class)->create();
+        //Create user
+        $user = factory(User::class)->create();
+        //Create task
+        $task = factory(Task::class)->create();
+        //Create a delegation
+        factory(Delegation::class)->create([
+            'DEL_THREAD_STATUS' => 'CLOSED',
+            'APP_NUMBER' => $application->APP_NUMBER,
+            'TAS_UID' => $task->TAS_UID,
+        ]);
+        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $this->assertEmpty($result);
+    }
 }
\ No newline at end of file
diff --git a/workflow/engine/methods/cases/proxySaveReassignCasesList.php b/workflow/engine/methods/cases/proxySaveReassignCasesList.php
index 01bd39698..958f6bdb8 100644
--- a/workflow/engine/methods/cases/proxySaveReassignCasesList.php
+++ b/workflow/engine/methods/cases/proxySaveReassignCasesList.php
@@ -2,132 +2,81 @@
 /**
  * proxySaveReassignCasesList.php
  *
- * ProcessMaker Open Source Edition
- * Copyright (C) 2004 - 2008 Colosa Inc.23
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * For more information, contact Colosa Inc, 2566 Le Jeune Rd.,
- * Coral Gables, FL, 33134, USA, or email info@colosa.com.
+ * Reassign functionality only from the cases list Review
+ * @see https://wiki.processmaker.com/3.0/Cases#Reassign
  */
-$aData = G::json_decode( $_POST['data'] );
-$appSelectedUids = array ();
-$items = explode( ",", $_POST['APP_UIDS'] );
-foreach ($items as $item) {
-    $dataUids = explode( "|", $item );
-    $appSelectedUids[] = $dataUids[0];
-}
+
+use ProcessMaker\Model\Delegation;
+
+// $_POST['data'] is information about the cases that will reassign
+$dataPost = G::json_decode($_POST['data']);
 
 $casesReassignedCount = 0;
-$serverResponse = array ();
+$serverResponse = [];
 
-$oCases = new Cases();
-
-$oAppCacheView = new AppCacheView();
-$oAppDel = new AppDelegation();
-$oCasesReassignList = $oAppCacheView->getToReassignListCriteria(null);
-if (isset( $_POST['selected'] ) && $_POST['selected'] == 'true') {
-    $oCasesReassignList->add( AppCacheViewPeer::APP_UID, $appSelectedUids, Criteria::IN );
-}
 // if there are no records to save return -1
-if (empty( $aData )) {
-    $serverResponse['TOTAL'] = - 1;
-    echo G::json_encode( $serverResponse );
+if (empty($dataPost)) {
+    $serverResponse['TOTAL'] = -1;
+
+    echo G::json_encode($serverResponse);
     die();
-}
-
-if (is_array( $aData )) {
+} elseif (is_array($dataPost)) {
+    $cases = new Cases();
     $currentCasesReassigned = 0;
-    require_once ("classes/model/AppNotes.php");
-    foreach ($aData as $data) {
-        $oTmpReassignCriteria = $oCasesReassignList;
-        $oTmpReassignCriteria->add( AppCacheViewPeer::APP_UID, $data->APP_UID );
-        $oTmpReassignCriteria->add( AppCacheViewPeer::TAS_UID, $data->TAS_UID );
-        $rs = AppCacheViewPeer::doSelectRS( $oTmpReassignCriteria );
-        $rs->setFetchmode( ResultSet::FETCHMODE_ASSOC );
-        $rs->next();
-        $row = $rs->getRow();
-
-        //Current users of OPEN DEL_INDEX thread
-        $aCurUser = $oAppDel->getCurrentUsers($row['APP_UID'], $row['DEL_INDEX']);
-        $flagReassign = true;
-        if(!empty($aCurUser)){
-            foreach ($aCurUser as $key => $value) {
-                if($value === $data->APP_REASSIGN_USER_UID){
+    foreach ($dataPost as $data) {
+        // It was supposed will return only one thread related to the task
+        // todo: implement the reassign case for multi instance task
+        $openThreads = Delegation::getOpenThreads($data->APP_NUMBER, $data->TAS_UID);
+        if (!empty($openThreads)) {
+            // Get the user information assigned in the index
+            $currentUsrUid = Delegation::getCurrentUser($openThreads['APP_NUMBER'], $openThreads['DEL_INDEX']);
+            $flagReassign = true;
+            // Define the flag: it was supposed that the case was assigned another person
+            if (!empty($currentUsrUid)) {
+                if ($currentUsrUid === $data->APP_REASSIGN_USER_UID) {
                     $flagReassign = false;
                 }
+            } else {
+                // Return an error if the index was CLOSED
+                throw new Exception(G::LoadTranslation('ID_REASSIGNMENT_ERROR'));
+            }
+            // If the currentUsrUid is different to nextUser, create the thread
+            if ($flagReassign) {
+                $cases->reassignCase(
+                    $openThreads['APP_UID'],
+                    $openThreads['DEL_INDEX'],
+                    (!empty($openThreads['USR_UID']) ? $openThreads['USR_UID'] : $_SESSION['USER_LOGGED']),
+                    $data->APP_REASSIGN_USER_UID
+                );
+            }
+
+            $currentCasesReassigned++;
+            $casesReassignedCount++;
+            $serverResponse[] = [
+                'APP_REASSIGN_USER' => $data->APP_REASSIGN_USER,
+                'APP_TITLE' => $data->APP_TITLE,
+                'TAS_TITLE' => $data->APP_TAS_TITLE,
+                'REASSIGNED_CASES' => $currentCasesReassigned
+            ];
+
+            // Save the note reassign reason
+            if (!empty($data->NOTE_REASON)) {
+                $appNotes = new AppNotes();
+                $noteContent = addslashes($data->NOTE_REASON);
+                $appNotes->postNewNote(
+                    $openThreads['APP_UID'],
+                    $_SESSION['USER_LOGGED'],
+                    $noteContent,
+                    isset($data->NOTIFY_REASSIGN) ? $data->NOTIFY_REASSIGN : false
+                );
             }
         } else {
-            //DEL_INDEX is CLOSED
+            // Return an error if the index was CLOSED
             throw new Exception(G::LoadTranslation('ID_REASSIGNMENT_ERROR'));
         }
-
-        //If the currentUser is diferent to nextUser, create the thread
-        if($flagReassign){
-            $oCases->reassignCase( $row['APP_UID'], $row['DEL_INDEX'], ($row['USR_UID'] != '' ? $row['USR_UID'] : $_SESSION['USER_LOGGED']), $data->APP_REASSIGN_USER_UID );
-        }
-
-        $currentCasesReassigned ++;
-        $casesReassignedCount ++;
-        $serverResponse[] = array ('APP_REASSIGN_USER' => $data->APP_REASSIGN_USER,'APP_TITLE' => $data->APP_TITLE,'TAS_TITLE' => $data->APP_TAS_TITLE,'REASSIGNED_CASES' => $currentCasesReassigned
-        );
-
-        // Save the note reassign reason
-        if (isset($data->NOTE_REASON) && $data->NOTE_REASON !== '') {
-            $appNotes = new AppNotes();
-            $noteContent = addslashes($data->NOTE_REASON);
-            $appNotes->postNewNote($row['APP_UID'], $_SESSION['USER_LOGGED'], $noteContent, isset($data->NOTIFY_REASSIGN) ? $data->NOTIFY_REASSIGN : false);
-        }
     }
-} else {
-    $oTmpReassignCriteria = $oCasesReassignList;
-    $oTmpReassignCriteria->add( AppCacheViewPeer::TAS_UID, $aData->TAS_UID );
-    $rs = AppCacheViewPeer::doSelectRS( $oTmpReassignCriteria );
-    $rs->setFetchmode( ResultSet::FETCHMODE_ASSOC );
-    $rs->next();
-    $row = $rs->getRow();
-    $currentCasesReassigned = 0;
-    while (is_array( $row )) {
-        $APP_UID = $row['APP_UID'];
-        $aCase = $oCases->loadCaseInCurrentDelegation( $APP_UID );
-
-        //Current users of OPEN DEL_INDEX thread
-        $aCurUser = $oAppDel->getCurrentUsers($APP_UID, $aCase['DEL_INDEX']);
-        $flagReassign = true;
-        if(!empty($aCurUser)){
-            foreach ($aCurUser as $key => $value) {
-                if($value === $aData->APP_REASSIGN_USER_UID){
-                    $flagReassign = false;
-                }
-            }
-        } else {
-            //DEL_INDEX is CLOSED
-            throw new Exception(G::LoadTranslation('ID_REASSIGNMENT_ERROR'));
-        }
-
-        //If the currentUser is diferent to nextUser, create the thread
-        if($flagReassign){
-            $oCases->reassignCase( $aCase['APP_UID'], $aCase['DEL_INDEX'], ($aCase['USR_UID'] != '' ? $aCase['USR_UID'] : $_SESSION['USER_LOGGED']), $aData->APP_REASSIGN_USER_UID );
-        }
-
-        $currentCasesReassigned ++;
-        $casesReassignedCount ++;
-        $rs->next();
-        $row = $rs->getRow();
-    }
-    $serverResponse[] = array ('TAS_TITLE' => $aData->APP_TAS_TITLE,'REASSIGNED_CASES' => $currentCasesReassigned);
 }
+
 $serverResponse['TOTAL'] = $casesReassignedCount;
-echo G::json_encode( $serverResponse );
+echo G::json_encode($serverResponse);
 
diff --git a/workflow/engine/src/ProcessMaker/Model/Delegation.php b/workflow/engine/src/ProcessMaker/Model/Delegation.php
index 5c3c7475f..0749b00ba 100644
--- a/workflow/engine/src/ProcessMaker/Model/Delegation.php
+++ b/workflow/engine/src/ProcessMaker/Model/Delegation.php
@@ -505,4 +505,55 @@ class Delegation extends Model
 
         return $query->count();
     }
+
+    /**
+     * This function get the current user related to the specific case and index
+     *
+     * @param integer $appNumber, Case number
+     * @param integer $index, Index to review
+     * @param string $status, The status of the thread
+     *
+     * @return string
+     */
+    public static function getCurrentUser($appNumber, $index, $status = 'OPEN')
+    {
+        $query = Delegation::query()->select('USR_UID');
+        $query->where('APP_NUMBER', $appNumber);
+        $query->where('DEL_INDEX', $index);
+        $query->where('DEL_THREAD_STATUS', $status);
+        $query->first();
+        $results = $query->get();
+
+        $userUid = '';
+        $results->each(function ($item, $key) use (&$userUid) {
+            $userUid = $item->USR_UID;
+        });
+
+        return $userUid;
+    }
+
+    /**
+     * Return the open thread related to the task
+     *
+     * @param integer $appNumber, Case number
+     * @param string $tasUid, The task uid
+     *
+     * @return array
+     */
+    public static function getOpenThreads($appNumber, $tasUid)
+    {
+        $query = Delegation::query()->select();
+        $query->where('DEL_THREAD_STATUS', 'OPEN');
+        $query->where('DEL_FINISH_DATE', null);
+        $query->where('APP_NUMBER', $appNumber);
+        $query->where('TAS_UID', $tasUid);
+        $results = $query->get();
+
+        $arrayOpenThreads = [];
+        $results->each(function ($item, $key) use (&$arrayOpenThreads) {
+            $arrayOpenThreads = $item->toArray();
+        });
+
+        return $arrayOpenThreads;
+    }
 }
diff --git a/workflow/engine/templates/cases/casesList.js b/workflow/engine/templates/cases/casesList.js
index f9ff4d3ac..3d816942b 100644
--- a/workflow/engine/templates/cases/casesList.js
+++ b/workflow/engine/templates/cases/casesList.js
@@ -722,39 +722,6 @@ Ext.onReady ( function() {
         }
     });
 
-    var btnExecReassign = new Ext.Button ({
-        text: _('ID_REASSIGN_ALL'),
-        // text: 'Reassign All',
-        //    text: TRANSLATIONS.LABEL_SELECT_ALL,
-        handler: function(){
-
-            var rs = storeReassignCases.getModifiedRecords();
-            var sv = [];
-            for(var i = 0; i <= rs.length-1; i++){
-                //sv[i]= rs[i].data['name'];
-                sv[i]= rs[i].data;
-            }
-            var gridData = storeReassignCases.getModifiedRecords();
-
-            Ext.Ajax.request({
-                url: 'proxySaveReassignCasesList',
-                success: function(response) {
-                    newPopUp.hide();
-                    storeCases.reload();
-                },
-                params: { APP_UIDS:ids, data:Ext.util.JSON.encode(sv), selected:false }
-            });
-
-            /*
-             storeReassignCases.setBaseParam('selected', false);
-             var result = storeReassignCases.save();
-             newPopUp.hide();
-             storeCases.reload();
-             */
-            //storeReassignCases.reload();
-        }
-    });
-
     var ExecReassign = function () {
         newPopUp.hide();
         var rs = storeReassignCases.getModifiedRecords();
@@ -2569,7 +2536,6 @@ Ext.onReady ( function() {
     //newPopUp.add(reassignGrid);
     newPopUp.add(gridForm);
     newPopUp.addButton(btnExecReassignSelected);
-    //newPopUp.addButton(btnExecReassign);
     newPopUp.addButton(btnCloseReassign);
 
     //storeProcesses.load();