diff --git a/main/exercise/exercise.class.php b/main/exercise/exercise.class.php
index 5aba2b1938..96cc7eb859 100755
--- a/main/exercise/exercise.class.php
+++ b/main/exercise/exercise.class.php
@@ -9659,7 +9659,10 @@ class Exercise
                                 Display::return_icon('announce.png', get_lang('EmailNotifySubscription')),
                                 '',
                                 [
-                                    'href' => 'exercise.php?'.api_get_cidreq().'&choice=send_reminder&sec_token='.$token.'&exerciseId='.$row['id'],
+                                    'href' => '#!',
+                                    'onclick' => 'showUserToSendNotificacion(this)',
+                                    'data-link' => 'exercise.php?'.api_get_cidreq().'&choice=send_reminder&sec_token='.$token.'&exerciseId='.$row['id'],
+
                                 ]
                             );
                         }
@@ -10961,8 +10964,9 @@ class Exercise
         $exerciseId = 0,
         $courseId = 0,
         $sessionId = 0,
-        $count = false)
-    {
+        $count = false,
+        $toUsers = []
+    ) {
         $data = [];
         $sessionId = empty($sessionId) ? api_get_session_id() : (int) $sessionId;
         $courseId = empty($courseId) ? api_get_course_id() : (int) $courseId;
@@ -10975,6 +10979,7 @@ class Exercise
         $tblSessionRelUser = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
         $tblQuiz = Database::get_course_table(TABLE_QUIZ_TEST);
         $countSelect = " count(*) as total";
+        $sqlToUsers = '';
         if (0 == $sessionId) {
             // Courses
             if (false === $count) {
@@ -10998,12 +11003,15 @@ class Exercise
                 INNER JOIN $tblCourse as c ON ( cru.c_id = c.id )
                 INNER JOIN $tblQuiz as cq ON ( cq.c_id = c.id )
             WHERE
-                cru.is_tutor = 0
+                cru.is_tutor is null
                 AND ( cq.session_id = 0 or cq.session_id is null)
                 AND cq.active > 0
                 AND cq.c_id = $courseId
                 AND cq.iid = $exerciseId
-            ORDER BY cq.c_id";
+            ";
+            if (!empty($toUsers)) {
+                $sqlToUsers = ' AND cru.user_id IN ('.implode(',', $toUsers).') ';
+            }
         } else {
             //Sessions
             if (false === $count) {
@@ -11012,12 +11020,15 @@ class Exercise
                 cq.iid as quiz_id,
                 sru.user_id as user_id,
                 cq.c_id as course_id,
-                cq.session_id as session_id,
+                sru.session_id as session_id,
                 c.title as title,
                 c.`code` as 'code',
                 cq.active as active
                 ";
             }
+            if (!empty($toUsers)) {
+                $sqlToUsers = ' AND sru.user_id IN ('.implode(',', $toUsers).') ';
+            }
             $sql = "
             SELECT
                    $countSelect
@@ -11030,9 +11041,9 @@ class Exercise
               AND cq.c_id = $courseId
               AND sru.session_id = $sessionId
               AND cq.iid = $exerciseId
-            ORDER BY
-              cq.c_id";
+           ";
         }
+        $sql .= " $sqlToUsers ORDER BY cq.c_id ";
 
         $result = Database::query($sql);
         $data = Database::store_result($result);
@@ -11040,7 +11051,16 @@ class Exercise
         if (true === $count) {
             return (isset($data[0]) && isset($data[0]['total'])) ? $data[0]['total'] : 0;
         }
-
+        $usersArray = [];
+        foreach($data as $index =>$item){
+            if(isset($item['user_id'])){
+                if(!isset($usersArray[$item['user_id']])){
+                    $usersArray[$item['user_id']] = api_get_user_info($item['user_id']);
+                }
+                $userData = $usersArray[$item['user_id']];
+                $data[$index]['user_name']=$userData['complete_name'];
+            }
+        }
         return $data;
     }
 
@@ -11055,12 +11075,15 @@ class Exercise
     public static function notifyUsersOfTheExercise(
         $exerciseId = 0,
         $courseId = 0,
-        $sessionId = 0
+        $sessionId = 0,
+        $toUsers = []
     ) {
         $users = self::getUsersInExercise(
             $exerciseId,
             $courseId,
-            $sessionId
+            $sessionId,
+            false,
+            $toUsers
         );
         $totalUsers = count($users);
         $usersArray = [];
diff --git a/main/exercise/exercise.php b/main/exercise/exercise.php
index c8accf498b..b3ea3735de 100644
--- a/main/exercise/exercise.php
+++ b/main/exercise/exercise.php
@@ -19,6 +19,81 @@ $this_section = SECTION_COURSES;
 
 $htmlHeadXtra[] = api_get_asset('qtip2/jquery.qtip.min.js');
 $htmlHeadXtra[] = api_get_css_asset('qtip2/jquery.qtip.min.css');
+$htmlHeadXtra[] = "
+<div class=\"modal fade\" id=\"NotificarUsuarios\" tabindex=\"-1\" role=\"dialog\" aria-labelledby=\"myModalLabel\">
+    <div class=\"modal-dialog\" role=\"document\">
+        <div class=\"modal-content\">
+            <div class=\"modal-header\">
+                <button type=\"button\" class=\"close\" data-dismiss=\"modal\" aria-label=\"Close\">
+                <span aria-hidden=\"true\">&times;</span></button>
+                <h4 class=\"modal-title\" id=\"myModalLabel\">
+
+                </h4>
+            </div>
+            <div class=\"modal-body\">
+                <form action=\"#\" class=\"form-horizontal\">
+                    <div class='col-md-6'>
+                        ".get_lang('EmailNotifySubscription')."
+                    </div>
+                    <div class='col-md-6'>
+                        <select
+                            class=\"selectpicker form-control\"
+                            multiple=\"multiple\"
+                            id=\"toUsers\"
+                            name=\"toUsers\"
+                        >
+                            <option value=\"\">-</option>
+                        </select>
+                    </div>
+                    <input class='hidden' id='urlTo' type='hidden'>
+               </form>
+               <div class='clearfix clear-fix'></div>
+            </div>
+            <div class=\"modal-footer\">
+              <button type=\"button\" class=\"btn btn-default\" onclick='sendNotificationToUsers()' data-dismiss=\"modal\">".get_lang('SendMailToUsers')."
+              </button>
+              <button type=\"button\" class=\"btn btn-default\" data-dismiss=\"modal\">".get_lang('Close')."
+              </button>
+            </div>
+        </div>
+    </div>
+</div>";
+$htmlHeadXtra[] = '<script>
+function sendNotificationToUsers(){
+   var sendTo = $("#toUsers").val().join(",");
+   var url = $("#urlTo").val() + sendTo;
+   $("#toUsers").find("option").remove().end().selectpicker("refresh");
+   $.ajax({
+        url: url,
+        dataType: "json"
+    }).done(function(response) {
+        $("#cm-tools").html(response.message);
+    }).always(function() {
+        $("#toUsers").find("option").remove().end().selectpicker("refresh");
+        $("#urlTo").val("");
+    });
+}
+function showUserToSendNotificacion(element){
+    var url = $(element).data("link");
+    $("#toUsers").find("option").remove().end().selectpicker("refresh");
+    $("#urlTo").val("");
+    $.ajax({
+        url: url,
+        dataType: "json",
+    }).done(function(response) {
+        $("#toUsers").find("option").remove().end().selectpicker("refresh");
+        $.each(response,function(a,b){
+            $("#toUsers").append($("<option>", {
+                value: b.user_id,
+                text: b.user_name
+            }));
+        });
+        $("#urlTo").val($(element).data("link").replace("send_reminder","send_reminder_to") + "&users=")
+        $("#toUsers").selectpicker("refresh");
+        $("#NotificarUsuarios").modal()
+    });
+}
+</script>';
 
 api_protect_course_script(true);
 
@@ -411,18 +486,39 @@ if ($is_allowedToEdit) {
                             'confirmation'
                         ));
                         break;
+                    case 'send_reminder_to':
+                        $toUsers = isset($_GET['users'])?$_GET['users']:null;
+                        if(
+                            !empty($toUsers) &&
+                            !empty($exerciseId)
+                        ) {
+                            $toUsers = explode(',',$toUsers);
+                            api_set_more_memory_and_time_limits();
+                            Exercise::notifyUsersOfTheExercise(
+                                $exerciseId,
+                                $courseId,
+                                $sessionId,
+                                $toUsers
+                            );
+                            echo json_encode([
+                                'message'=>Display::return_message(
+                                get_lang('AnnounceSentByEmail'),
+                                'confirmation'
+                            ),
+                                ]);
+                        }
+                        exit();
+                        break;
                     case 'send_reminder':
-                        api_set_more_memory_and_time_limits();
-                        $objExerciseTmp->notifyUsersOfTheExercise(
-                            $exerciseId,
+
+                        $users = Exercise::getUsersInExercise(
+                            $objExerciseTmp->id,
                             $courseId,
                             $sessionId
                         );
+                        echo json_encode($users);
+                        exit();
 
-                        Display::addFlash(Display::return_message(
-                            get_lang('AnnounceSentByEmail'),
-                            'confirmation'
-                        ));
                         break;
                 }
                 header('Location: '.$currentUrl);