diff --git a/openslides/openslides_settings.py b/openslides/openslides_settings.py
index 6486831dd..ed2b0145e 100755
--- a/openslides/openslides_settings.py
+++ b/openslides/openslides_settings.py
@@ -124,7 +124,6 @@ INSTALLED_APPS = (
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'mptt',
-    'openslides.utils',
     'openslides.poll',
     'openslides.projector',
     'openslides.agenda',
diff --git a/openslides/participant/tests.py b/openslides/participant/tests.py
new file mode 100644
index 000000000..fa4026335
--- /dev/null
+++ b/openslides/participant/tests.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+    openslides.participant.tests
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Unit test for the participant app.
+
+    :copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
+    :license: GNU GPL, see LICENSE for more details.
+"""
+
+from django.test import TestCase
+from django.test.client import Client
+from django.contrib.auth.models import User, Group
+from django.db.models.query import EmptyQuerySet
+from django.contrib.auth.hashers import check_password
+
+from openslides.utils.user import get_user, Users
+from openslides.participant.api import gen_username, gen_password, user2djangouser
+from openslides.participant.models import Profile, DjangoGroup, DjangoUser
+
+
+class ParticipantTest(TestCase):
+    def setUp(self):
+        self.user1 = User(first_name=u'Max', last_name=u'Mustermann')
+        self.user1.username = gen_username(self.user1.first_name, self.user1.last_name)
+        self.user1.save()
+        self.participant1 = Profile.objects.create(user=self.user1, firstpassword=gen_password())
+
+    def test_participant_user(self):
+        self.assertEqual(self.user1.profile, self.participant1)
+        self.assertEqual(self.user1, self.participant1.user)
+
+    def test_repr(self):
+        self.assertEqual(unicode(self.participant1), u'Max Mustermann')
+
+    def test_group(self):
+        self.participant1.group = u'München'
+        self.participant1.save()
+        self.assertEqual(unicode(self.participant1), u'Max Mustermann (München)')
+
+    def test_reset_password(self):
+        self.assertIsInstance(self.participant1.firstpassword, basestring)
+        self.assertEqual(len(self.participant1.firstpassword), 8)
+        self.user1.set_unusable_password()
+        self.assertFalse(self.user1.check_password(self.participant1.firstpassword))
+        self.participant1.reset_password()
+        self.assertTrue(self.user1.check_password(self.participant1.firstpassword))
+
+    def test_user_api(self):
+        self.assertTrue(hasattr(self.participant1, 'uid'))
+        self.assertEqual(self.participant1.uid, 'participant:1')
+        self.assertEqual(get_user('participant:1'), self.participant1)
+        self.assertEqual(len(Users()), 1)
+
+
+class DjangoGroupTest(TestCase):
+    def setUp(self):
+        self.group1 = Group.objects.create(name='Test Group')
+        self.djangogroup1 = DjangoGroup.objects.create(group=self.group1)
+
+    def test_group_djangogroup(self):
+        self.assertEqual(self.djangogroup1.group, self.group1)
+
+    def test_user_api(self):
+        self.assertTrue(hasattr(self.djangogroup1, 'uid'))
+        self.assertEqual(self.djangogroup1.uid, 'djangogroup:1')
+        self.assertEqual(get_user('djangogroup:1'), self.djangogroup1)
+
+
+class DjangoUserTest(TestCase):
+    def setUp(self):
+        self.user1 = User.objects.create(username='admin')
+        self.djangouser1 = DjangoUser.objects.get(pk=1)
+
+    def test_djangouser_user(self):
+        self.assertEqual(self.user1.pk, self.djangouser1.pk)
+
+    def test_has_no_profile(self):
+        self.assertTrue(self.djangouser1.has_no_profile())
+
+    def test_user_api(self):
+        self.assertTrue(hasattr(self.djangouser1, 'uid'))
+        self.assertEqual(self.djangouser1.uid, 'djangouser:1')
+        self.assertEqual(get_user('djangouser:1'), self.djangouser1)
+        self.assertEqual(user2djangouser(self.user1), self.djangouser1)
diff --git a/openslides/utils/user/api.py b/openslides/utils/user/api.py
index 02191896d..7e418ab61 100644
--- a/openslides/utils/user/api.py
+++ b/openslides/utils/user/api.py
@@ -22,15 +22,26 @@ class Users(object):
         self.id = id
 
     def __iter__(self):
-        for receiver, users in receiv_users.send(
-                sender='users', user_prefix=self.user_prefix, id=self.id):
-            for user in users:
-                yield user
+        try:
+            return iter(self._cache)
+        except AttributeError:
+            return iter(self.iter_users())
+
+    def __len__(self):
+        return len(list(self.__iter__()))
 
     def __getitem__(self, key):
         user_list = list(self)
         return user_list[key]
 
+    def iter_users(self):
+        self._cache = list()
+        for receiver, users in receiv_users.send(
+                sender='users', user_prefix=self.user_prefix, id=self.id):
+            for user in users:
+                self._cache.append(user)
+                yield user
+
 
 def generate_uid(prefix, id):
     if ':' in prefix: