diff --git a/openslides/participant/models.py b/openslides/participant/models.py
index d892b38e2..fe19ff9de 100644
--- a/openslides/participant/models.py
+++ b/openslides/participant/models.py
@@ -89,17 +89,6 @@ class Profile(models.Model, UserMixin):
         )
 
 
-class ParticipantUsers(object):
-    user_prefix = Profile.user_prefix
-
-    def __iter__(self):
-        for profile in Profile.objects.all():
-            yield profile
-
-    def __getitem__(self, key):
-        return Profile.objects.get(pk=key)
-
-
 class DjangoGroup(models.Model, UserMixin):
     user_prefix = 'djangogroup'
 
@@ -109,20 +98,33 @@ class DjangoGroup(models.Model, UserMixin):
         return unicode(self.group)
 
 
-class DjangoGroupUsers(object):
-    user_prefix = DjangoGroup.user_prefix
+class ParticipantUsers(object):
+    def __init__(self, user_prefix=None, id=None):
+        self.user_prefix = user_prefix
+        self.id = id
 
     def __iter__(self):
-        for group in DjangoGroup.objects.all():
-            yield group
+        if not self.user_prefix or self.user_prefix == Profile.user_prefix:
+            if self.id:
+                yield Profile.objects.get(pk=self.id)
+            else:
+                for profile in Profile.objects.all():
+                    yield profile
+
+        if not self.user_prefix or self.user_prefix == DjangoGroup.user_prefix:
+            if self.id:
+                yield DjangoGroup.objects.get(pk=self.id)
+            else:
+                for group in DjangoGroup.objects.all():
+                    yield group
 
     def __getitem__(self, key):
-        return DjangoGroup.objects.get(pk=key)
+        return Profile.objects.get(pk=key)
 
 
 @receiver(receiv_users, dispatch_uid="participant_profile")
 def receiv_users(sender, **kwargs):
-    return [ParticipantUsers(), DjangoGroupUsers()]
+    return ParticipantUsers(user_prefix=kwargs['user_prefix'], id=kwargs['id'])
 
 
 @receiver(default_config_value, dispatch_uid="participant_default_config")
diff --git a/openslides/utils/user/__init__.py b/openslides/utils/user/__init__.py
index 229ada3c4..d65ebb21a 100644
--- a/openslides/utils/user/__init__.py
+++ b/openslides/utils/user/__init__.py
@@ -87,28 +87,31 @@ def split_uid(uid):
 
 def get_user(uid):
     try:
-        user_type, id = split_uid(uid)
+        user_prefix, id = split_uid(uid)
     except TypeError:
         return EmtyUser()
 
-    for receiver, users_list in receiv_users.send(sender='get_user'):
-        for users in users_list:
-            if users.user_prefix == user_type:
-                return users[id]
-    # TODO: Use own Exception
-    raise Exception('User with uid %s does not exist' % uid)
+    return Users(user_prefix=user_prefix, id=id)[0]
 
 
 class Users(object):
     """
     A Storage for a multiplicity of different User-Objects.
     """
+    def __init__(self, user_prefix=None, id=None):
+        self.user_prefix = user_prefix
+        self.id = id
+
     def __iter__(self):
-        for receiver, users_list in receiv_users.send(sender='users'):
-            for users in users_list:
-                # Does iter(users) work?
-                for user in users:
-                    yield user
+        for receiver, users in receiv_users.send(sender='users', user_prefix=self.user_prefix, id=self.id):
+            # Does iter(users) work?
+            for user in users:
+                yield user
+
+    def __getitem__(self, key):
+        user_list = list(self)
+        print user_list
+        return user_list[key]
 
 
 def generate_uid(prefix, id):
diff --git a/openslides/utils/user/signals.py b/openslides/utils/user/signals.py
index 8f1b1c20d..5779db7ab 100644
--- a/openslides/utils/user/signals.py
+++ b/openslides/utils/user/signals.py
@@ -12,4 +12,4 @@
 
 from django.dispatch import Signal
 
-receiv_users = Signal(providing_args=[])
+receiv_users = Signal(providing_args=['user_prefix', 'id'])