diff --git a/openslides/assignment/models.py b/openslides/assignment/models.py
index 749296470..b70972234 100644
--- a/openslides/assignment/models.py
+++ b/openslides/assignment/models.py
@@ -160,6 +160,7 @@ class Assignment(models.Model, SlideMixin):
         participants = []
         for candidate in candidates.all():
             participants.append(candidate.person)
+        participants.sort(key=lambda person: person.sort_name)
         return participants
         #return candidates.values_list('person', flat=True)
 
@@ -178,7 +179,6 @@ class Assignment(models.Model, SlideMixin):
         poll.set_options([{'candidate': person} for person in self.candidates])
         return poll
 
-
     def vote_results(self, only_published):
         """
         returns a table represented as a list with all candidates from all
diff --git a/openslides/assignment/views.py b/openslides/assignment/views.py
index 4abf2fb80..5adbf0188 100644
--- a/openslides/assignment/views.py
+++ b/openslides/assignment/views.py
@@ -539,7 +539,7 @@ class AssignmentPollPDF(PDFView):
             stylesheet['Ballot_title']))
         cell.append(Paragraph(self.poll.assignment.polldescription,
             stylesheet['Ballot_subtitle']))
-        options = self.poll.get_options().order_by('candidate')
+        options = self.poll.get_options()
 
         ballot_string = _("%d. ballot") % self.poll.get_ballot()
         candidate_string = ungettext("%d candidate", "%d candidates",
diff --git a/openslides/motion/models.py b/openslides/motion/models.py
index c29133ebf..380b7de3a 100644
--- a/openslides/motion/models.py
+++ b/openslides/motion/models.py
@@ -162,8 +162,8 @@ class Motion(models.Model, SlideMixin):
 
     @property
     def supporters(self):
-        for object in self.motionsupporter_set.all():
-            yield object.person
+        return sorted([object.person for object in self.motionsupporter_set.all()],
+                      key=lambda person: person.sort_name)
 
     def is_supporter(self, person):
         try:
diff --git a/openslides/participant/models.py b/openslides/participant/models.py
index 2437ceba7..14758a16d 100644
--- a/openslides/participant/models.py
+++ b/openslides/participant/models.py
@@ -83,6 +83,12 @@ class User(DjangoUser, PersonMixin, Person, SlideMixin):
         self.set_password(password)
         self.save()
 
+    @property
+    def sort_name(self):
+        if config['participant_sort_users_by_first_name']:
+            return self.first_name.lower()
+        return self.last_name.lower()
+
     @models.permalink
     def get_absolute_url(self, link='view'):
         """
diff --git a/openslides/utils/person/api.py b/openslides/utils/person/api.py
index 5c842dea2..1dff34d3d 100644
--- a/openslides/utils/person/api.py
+++ b/openslides/utils/person/api.py
@@ -29,6 +29,14 @@ class Person(object):
         """
         return str(self.person_id)
 
+    @property
+    def sort_name(self):
+        """
+        Return the part of the name, which is used for sorting.
+        For example the pre-name or the last-name
+        """
+        return self.clean_name.lower()
+
     @property
     def clean_name(self):
         """
diff --git a/openslides/utils/person/forms.py b/openslides/utils/person/forms.py
index 2330443dc..cee080bce 100644
--- a/openslides/utils/person/forms.py
+++ b/openslides/utils/person/forms.py
@@ -22,7 +22,7 @@ class PersonChoices(object):
     def __iter__(self):
         if self.field.empty_label is not None:
             yield (u"", self.field.empty_label)
-        for person in Persons():
+        for person in sorted(Persons(), key=lambda person: person.sort_name):
             yield (person.person_id, person)