diff --git a/app/assets/javascripts/submission_statistics.js b/app/assets/javascripts/submission_statistics.js
index 75fe42cd..9cb820a0 100644
--- a/app/assets/javascripts/submission_statistics.js
+++ b/app/assets/javascripts/submission_statistics.js
@@ -55,6 +55,8 @@ $(function() {
     var submissions = $('#data').data('submissions');
     var files = $('#data').data('files');
     var filetypes = $('#data').data('file-types');
+    var playButton = $('#play-button');
+    var playInterval = undefined;
 
     editor = ace.edit('current-file');
     editor.setShowPrintMargin(false);
@@ -88,6 +90,23 @@ $(function() {
       showActiveFile();
     });
 
+    playButton.on('click', function(event) {
+      if (playInterval == undefined) {
+        playInterval = setInterval(function() {
+          if ($.isController('exercises') && $('#timeline').isPresent() && slider.val() < submissions.length - 1) {
+            slider.val(parseInt(slider.val()) + 1);
+            slider.change()
+          } else {
+            clearInterval(playInterval);
+          }
+        }, 5000);
+        playButton.find('span.fa').removeClass('fa-play').addClass('fa-pause')
+      } else {
+        clearInterval(playInterval);
+        playButton.find('span.fa').removeClass('fa-pause').addClass('fa-play')
+      }
+    });
+
     active_file = files[0][0]
     initializeFileTree();
     showActiveFile();
diff --git a/app/assets/stylesheets/statistics.css.scss b/app/assets/stylesheets/statistics.css.scss
index d148f782..631de920 100644
--- a/app/assets/stylesheets/statistics.css.scss
+++ b/app/assets/stylesheets/statistics.css.scss
@@ -10,3 +10,19 @@
 .clickable {
     cursor: pointer;
 }
+
+.flex-container {
+    display: flex;
+}
+
+.flex-item {
+    flex-grow: 1;
+}
+
+#play-button {
+    height: 40px;
+    width: 40px;
+    margin-right: 15px;
+    margin-top: auto;
+    margin-bottom: auto;
+}
diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index 192c4513..a6b5b8a8 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -53,7 +53,7 @@ class Exercise < ActiveRecord::Base
             (SELECT user_id,
                     id,
                     (created_at - lag(created_at) over (PARTITION BY user_id
-                                                        ORDER BY id)) AS working_time
+                                                        ORDER BY created_at)) AS working_time
             FROM submissions
             WHERE exercise_id=#{id}) AS foo) AS bar
       GROUP BY user_id
diff --git a/app/views/exercises/external_users/statistics.html.slim b/app/views/exercises/external_users/statistics.html.slim
index ca5142cc..fd66ca26 100644
--- a/app/views/exercises/external_users/statistics.html.slim
+++ b/app/views/exercises/external_users/statistics.html.slim
@@ -21,14 +21,17 @@ h1 = "#{@exercise} (external user #{@external_user})"
     div class=(@exercise.hide_file_tree ? 'col-sm-12' : 'col-sm-9')
       #current-file.editor
 
-  #submissions-slider
-    input type='range' orient='horizontal' list='datapoints' min=0 max=submissions.length-1 value=0
-    datalist#datapoints
-      - index=0
-      - submissions.each do |submission|
-        option data-submission=submission
-          =index
-        - index += 1
+  .flex-container
+    button.btn.btn-default id='play-button'
+      span.fa.fa-play
+    #submissions-slider.flex-item
+      input type='range' orient='horizontal' list='datapoints' min=0 max=submissions.length-1 value=0
+      datalist#datapoints
+        - index=0
+        - submissions.each do |submission|
+          option data-submission=submission
+            =index
+          - index += 1
 
   #timeline
     .table-responsive
diff --git a/app/views/external_users/statistics.html.slim b/app/views/external_users/statistics.html.slim
index 6c49b967..4a4c1e70 100644
--- a/app/views/external_users/statistics.html.slim
+++ b/app/views/external_users/statistics.html.slim
@@ -1,2 +1,18 @@
-h1 = @user
-H2 = 'Hallo'
\ No newline at end of file
+h1 = t('.title')
+
+- exercises = Exercise.where(:id => @user.submissions.group(:exercise_id).select(:exercise_id).distinct())
+
+.table-responsive
+  table.table
+    thead
+      tr
+        - ['.exercise', '.score', '.runs', '.worktime'].each do |title|
+          th.header = t(title)
+    tbody
+      - exercises.each do |exercise|
+        - submissions = @user.submissions.where(:exercise_id => exercise.id, :cause => ['submit', 'run'])
+        tr
+          td = link_to exercise, controller: "exercises", action: "statistics", external_user_id: @user.id, id: exercise.id
+          td = submissions.maximum(:score) or 0
+          td = submissions.count
+          td = exercise.average_working_time_for(@user.id) or 0
diff --git a/config/locales/de.yml b/config/locales/de.yml
index d96e6927..40b745ad 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -259,6 +259,13 @@ de:
         time: Zeit
         cause: Grund
         score: Punktzahl
+  external_users:
+    statistics:
+      title: Statistiken für Externe Benutzer
+      exercise: Übung
+      score: Bewertung
+      runs: Versuche
+      worktime: Arbeitszeit
   files:
     roles:
       main_file: Hauptdatei
diff --git a/config/locales/en.yml b/config/locales/en.yml
index dc63e3dd..501fe745 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -259,6 +259,13 @@ en:
         time: Time
         cause: Cause
         score: Score
+  external_users:
+    statistics:
+      title: External User Statistics
+      exercise: Exercise
+      score: Score
+      runs: Runs
+      worktime: Working Time
   files:
     roles:
       main_file: Main File