diff --git a/openslides/application/forms.py b/openslides/application/forms.py
index 2d4bf5518..9da1f3a83 100644
--- a/openslides/application/forms.py
+++ b/openslides/application/forms.py
@@ -15,6 +15,7 @@ from django.contrib.auth.models import User
 from django.utils.translation import ugettext_lazy as _, ugettext_noop
 
 from openslides.utils.forms import CssClassMixin
+from openslides.utils.user import UserFormField
 from openslides.application.models import Application
 
 
@@ -50,11 +51,7 @@ class ApplicationFormTrivialChanges(ApplicationForm):
 
 
 class ApplicationManagerForm(forms.ModelForm, CssClassMixin):
-    submitter = UserModelChoiceField(
-        queryset=User.objects.all().exclude(profile=None).
-        order_by("first_name"),
-        label=_("Submitter"),
-    )
+    submitter = UserFormField()
 
     class Meta:
         model = Application
diff --git a/openslides/application/models.py b/openslides/application/models.py
index c06b4716e..e0d8b738b 100644
--- a/openslides/application/models.py
+++ b/openslides/application/models.py
@@ -21,6 +21,7 @@ from django.utils.translation import pgettext
 from django.utils.translation import ugettext_lazy as _, ugettext_noop, ugettext
 
 from openslides.utils.utils import _propper_unicode
+from openslides.utils.user import UserField
 
 from openslides.config.models import config
 from openslides.config.signals import default_config_value
@@ -60,7 +61,7 @@ class Application(models.Model, SlideMixin):
         # genpoll
     )
 
-    submitter = models.ForeignKey(User, verbose_name=_("Submitter"))
+    submitter = UserField(verbose_name=_("Submitter"))
     supporter = models.ManyToManyField(User, related_name='supporter', \
                                        null=True, blank=True, verbose_name=_("Supporters"))
     number = models.PositiveSmallIntegerField(blank=True, null=True,
diff --git a/openslides/application/templates/application/view.html b/openslides/application/templates/application/view.html
index 0ae213ab0..dd9ad9c69 100644
--- a/openslides/application/templates/application/view.html
+++ b/openslides/application/templates/application/view.html
@@ -16,8 +16,8 @@
 <div id="sidebar">
     <div class="box">
     <h4>{% trans "Submitter" %}:</h4>
-    {{ application.submitter.profile }}
-    {% if user == application.submitter %}
+    {{ application.submitter }}
+    {% if user == application.submitter.user %}
     <img src="{% static 'images/icons/user-information.png' %}" title="{% trans 'You!' %}">
     {% endif %}
 
@@ -113,7 +113,7 @@
     {{ application.creation_time }}
 
     <p></p>
-    {% if "wit" in actions and user == application.submitter %}
+    {% if "wit" in actions and user == application.submitter.user %}
     <p></p>
         <a href='{% url application_set_status application.id 'wit' %}'>
             <span class="button"><span class="icon revert">{% trans 'Withdraw' %}</span></span>
diff --git a/openslides/application/views.py b/openslides/application/views.py
index 8e8fd39c7..6154abb13 100644
--- a/openslides/application/views.py
+++ b/openslides/application/views.py
@@ -180,7 +180,7 @@ def edit(request, application_id=None):
         return redirect(reverse('application_overview'))
     if application_id is not None:
         application = Application.objects.get(id=application_id)
-        if not request.user == application.submitter and not is_manager:
+        if not request.user == application.submitter.user and not is_manager:
             messages.error(request, _("You can not edit this application. You are not the submitter."))
             return redirect(reverse('application_view', args=[application.id]))
         actions = application.get_allowed_actions(user=request.user)
@@ -217,7 +217,7 @@ def edit(request, application_id=None):
                         original_supporters.append(s)
                 application = managerform.save(commit=False)
             elif application_id is None:
-                application = Application(submitter=request.user)
+                application = Application(submitter=request.user.profile)
             application.title = dataform.cleaned_data['title']
             application.text = dataform.cleaned_data['text']
             application.reason = dataform.cleaned_data['reason']
@@ -278,12 +278,14 @@ def edit(request, application_id=None):
         dataform = formclass(initial=initial, prefix="data")
         if is_manager:
             if application_id is None:
-                initial = {'submitter': str(request.user.id)}
+                try:
+                    initial = {'submitter': request.user.profile.uid}
+                except Profile.DoesNotExist:
+                    initial = {}
             else:
-                initial = {}
-            managerform = managerformclass(initial=initial, \
-                                                 instance=application, \
-                                                 prefix="manager")
+                initial = {'submitter': application.submitter.uid}
+            managerform = managerformclass(initial=initial,
+                instance=application, prefix="manager")
         else:
             managerform = None
     return {
diff --git a/openslides/participant/models.py b/openslides/participant/models.py
index 46c7e56b0..d892b38e2 100644
--- a/openslides/participant/models.py
+++ b/openslides/participant/models.py
@@ -10,19 +10,22 @@
     :license: GNU GPL, see LICENSE for more details.
 """
 
-from django.contrib.auth.models import User
+from django.contrib.auth.models import User, Group
 from django.db import models
 from django.db.models import Q
 from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _, ugettext_noop
 
+from openslides.utils.user import UserMixin
+from openslides.utils.user.signals import receiv_users
+
 from openslides.config.signals import default_config_value
 
 from openslides.participant.api import gen_password
 
 
-
-class Profile(models.Model):
+class Profile(models.Model, UserMixin):
+    user_prefix = 'participant'
     GENDER_CHOICES = (
         ('male', _('Male')),
         ('female', _('Female')),
@@ -86,6 +89,42 @@ class Profile(models.Model):
         )
 
 
+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'
+
+    group = models.OneToOneField(Group)
+
+    def __unicode__(self):
+        return unicode(self.group)
+
+
+class DjangoGroupUsers(object):
+    user_prefix = DjangoGroup.user_prefix
+
+    def __iter__(self):
+        for group in DjangoGroup.objects.all():
+            yield group
+
+    def __getitem__(self, key):
+        return DjangoGroup.objects.get(pk=key)
+
+
+@receiver(receiv_users, dispatch_uid="participant_profile")
+def receiv_users(sender, **kwargs):
+    return [ParticipantUsers(), DjangoGroupUsers()]
+
+
 @receiver(default_config_value, dispatch_uid="participant_default_config")
 def default_config(sender, key, **kwargs):
     """
diff --git a/openslides/utils/user/__init__.py b/openslides/utils/user/__init__.py
new file mode 100644
index 000000000..ef539926a
--- /dev/null
+++ b/openslides/utils/user/__init__.py
@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+    openslides.utils.user.api
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Useful functions for the user object.
+
+    :copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
+    :license: GNU GPL, see LICENSE for more details.
+"""
+
+from django.db import models
+from django import forms
+
+from openslides.utils.user.signals import receiv_users
+
+
+class UserChoices():
+    def __init__(self, field):
+        self.field = field
+
+    def __iter__(self):
+        if self.field.empty_label is not None:
+            yield (u"", self.field.empty_label)
+        for user in Users():
+            yield (user.uid, user)
+
+
+class UserFormField(forms.fields.ChoiceField):
+    def __init__(self, required=True, initial=None, empty_label=u"---------", *args, **kwargs):
+
+        if required and (initial is not None):
+            self.empty_label = None
+        else:
+            self.empty_label = empty_label
+        #TODO use a own self.choices property, see ModelChoiceField
+        super(UserFormField, self).__init__(choices=UserChoices(field=self), required=required, initial=initial, *args, **kwargs)
+
+    def to_python(self, value):
+        print value
+        return get_user(value)
+
+    def valid_value(self, value):
+        return super(UserFormField, self).valid_value(value.uid)
+
+
+class UserField(models.fields.Field):
+    __metaclass__ = models.SubfieldBase
+
+    def __init__(self, *args, **kwargs):
+        super(UserField, self).__init__(max_length=255, *args, **kwargs)
+        # TODO: Validate the uid
+
+    def get_internal_type(self):
+        return "CharField"
+
+    def to_python(self, value):
+        """
+        Convert string value to a User Object.
+        """
+        if hasattr(value, 'uid'):
+            user =  value
+        else:
+            user = get_user(value)
+
+        user.prepare_database_save = lambda unused: UserField().get_prep_value(user)
+        return user
+
+    def get_prep_value(self, value):
+        return value.uid
+
+    def value_to_string(self, obj):
+        value = self._get_val_from_obj(obj)
+        return self.get_prep_value(value)
+
+    def formfield(self, **kwargs):
+        defaults = {'form_class': UserFormField}
+        defaults.update(kwargs)
+        return super(UserField, self).formfield(**defaults)
+
+
+def split_uid(uid):
+    data = uid.split(':', 1)
+    if len(data) == 2 and data[0] and data[1]:
+        return data
+    raise TypeError("Invalid uid: '%s'" % uid)
+
+
+def get_user(uid):
+    try:
+        user_type, 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)
+
+
+class Users(object):
+    """
+    A Storage for a multiplicity of different User-Objects.
+    """
+    def __iter__(self):
+        for receiver, users_list in receiv_users.send(sender='users'):
+            for users in users_list:
+                # Does iter(users) work?
+                print users
+                for user in users:
+                    print user
+                    yield user
+
+
+def generate_uid(prefix, id):
+    if ':' in prefix:
+        # TODO: Use the right Error.
+        raise Exception("':' is not allowed in a the 'user_prefix'")
+    return "%s:%d" % (prefix, id)
+
+
+# TODO: I dont need this object any more
+class UserMixin(object):
+    @property
+    def uid(self):
+        try:
+            return generate_uid(self.user_prefix, self.id)
+        except AttributeError:
+            raise AttributeError("%s has to have a attribute 'user_prefix'" % self)
+
+    def __repr__(self):
+        return 'User: %s' % self.uid
+
+
+class EmtyUser(UserMixin):
+    @property
+    def uid(self):
+        return 'emtyuser'
diff --git a/openslides/utils/user/signals.py b/openslides/utils/user/signals.py
new file mode 100644
index 000000000..8f1b1c20d
--- /dev/null
+++ b/openslides/utils/user/signals.py
@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+    openslides.utils.user.signals
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Defines Signals for the user.
+
+    :copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
+    :license: GNU GPL, see LICENSE for more details.
+"""
+
+from django.dispatch import Signal
+
+receiv_users = Signal(providing_args=[])