diff --git a/api/__init__.py b/api/__init__.py
new file mode 100644
index 0000000..08884cb
--- /dev/null
+++ b/api/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'api.apps.APIConfig'
diff --git a/api/apps.py b/api/apps.py
new file mode 100644
index 0000000..413e0bf
--- /dev/null
+++ b/api/apps.py
@@ -0,0 +1,6 @@
+from django.utils.translation import ugettext_lazy as _
+from django.apps import AppConfig
+
+class APIConfig(AppConfig):
+    name = 'api'
+    verbose_name = _("API")
diff --git a/api/event/serializers.py b/api/event/serializers.py
index cd7ba7a..13ab7fd 100644
--- a/api/event/serializers.py
+++ b/api/event/serializers.py
@@ -1,6 +1,12 @@
+from django.contrib.auth import get_user_model
 from django.shortcuts import get_object_or_404
+
 from rest_framework import serializers
-from event.models import Event, ActivityTag, Place, ActivityTemplate
+
+from event.models import Event, ActivityTag, Place, ActivityTemplate, Activity
+from api.users.serializers import UserSerializer
+
+User = get_user_model()
 
 
 # Event Serializer
@@ -111,5 +117,38 @@ class ActivityTemplateSerializer(serializers.ModelSerializer):
         return activity_template
 
 
+# TODO rajouter des permissions
 class ActivitySerializer(serializers.ModelSerializer):
-    pass
+    event = EventSerializer(read_only=True)
+    parent = serializers.PrimaryKeyRelatedField(
+            queryset=ActivityTemplate.objects.all(), allow_null=True)
+    en_perm = UserSerializer(read_only=True)
+    tags = ActivityTagSerializer(many=True)
+
+    class Meta:
+        model = Activity
+        fields = ('id', 'title', 'event', 'parent', 'is_public', 'has_perm',
+                  'min_perm', 'max_perm', 'en_perm', 'description', 'remarks',
+                  'tags', 'beginning', 'end', )
+
+    def update(self, instance, validated_data):
+        tags_data = validated_data.pop('tags')
+        validated_data.pop('event_pk')
+        event = instance.event
+        [setattr(instance, key, value)
+         for key, value in validated_data.items()]
+        instance.save()
+        tags = [ActivityTag.objects.get_or_create(event=event, **tag_data)[0]
+                for tag_data in tags_data]
+        instance.tags = tags
+        return instance
+
+    def create(self, validated_data):
+        tags_data = validated_data.pop('tags')
+        event_pk = validated_data.pop('event_pk')
+        event = event_pk and get_object_or_404(Event, id=event_pk) or None
+        activity = Activity.objects.create(event=event, **validated_data)
+        tags = [ActivityTag.objects.get_or_create(event=event, **tag_data)[0]
+                for tag_data in tags_data]
+        activity.tags = tags
+        return activity
diff --git a/api/event/views.py b/api/event/views.py
index b360583..316bc59 100644
--- a/api/event/views.py
+++ b/api/event/views.py
@@ -2,6 +2,7 @@ from django.contrib.auth import get_user_model
 from django.db.models import Q
 
 from rest_framework.viewsets import ModelViewSet
+from rest_framework.filters import OrderingFilter
 
 from api.event.serializers import EventSerializer, PlaceSerializer,\
     ActivityTagSerializer, ActivityTemplateSerializer, ActivitySerializer
@@ -51,6 +52,11 @@ class EventViewSet(ModelViewSet):
     queryset = Event.objects.all()
     serializer_class = EventSerializer
 
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', 'creation_date', 'beginning_date',
+                       'ending_date', )
+    ordering = ('beginning_date', )
+
     def perform_create(self, serializer):
         serializer.save(created_by=self.request.user)
 
@@ -59,11 +65,19 @@ class PlaceViewSet(EventSpecificViewSet):
     queryset = Place.objects.all()
     serializer_class = PlaceSerializer
 
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('name', )
+    ordering = ('name', )
+
 
 class ActivityTagViewSet(EventSpecificViewSet):
     queryset = ActivityTag.objects.all()
     serializer_class = ActivityTagSerializer
 
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('name', )
+    ordering = ('name', )
+
 
 class ActivityTemplateViewSet(ModelViewSet):
     """
@@ -82,6 +96,10 @@ class ActivityTemplateViewSet(ModelViewSet):
         event_pk = self.kwargs.get('event_pk')
         serializer.save(event_pk=event_pk)
 
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', )
+    ordering = ('title', )
+
 
 class ActivityViewSet(ModelViewSet):
     """
@@ -99,3 +117,7 @@ class ActivityViewSet(ModelViewSet):
     def perform_update(self, serializer):
         event_pk = self.kwargs.get('event_pk')
         serializer.save(event_pk=event_pk)
+
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', )
+    ordering = ('title', )
diff --git a/api/test_event.py b/api/test_event.py
index 62d77d5..6a8e352 100644
--- a/api/test_event.py
+++ b/api/test_event.py
@@ -4,14 +4,15 @@ from rest_framework.test import APITestCase
 
 from event.models import Event, Place, ActivityTag, ActivityTemplate
 
-from api.event.serializers import ActivityTemplateSerializer, EventSerializer
+from api.event.serializers import ActivityTemplateSerializer,\
+        EventSerializer, Activity
 from api.test_mixins import EventBasedModelTestMixin, EventSpecificTestMixin,\
         ModelTestMixin
 
 User = get_user_model()
 
 
-class EventTest(ModelTestMixin, APITestCase):
+class EventTests(ModelTestMixin, APITestCase):
     model = Event
     base_name = 'event'
     tested_fields = {'title': "I'm a test", }
@@ -22,10 +23,9 @@ class EventTest(ModelTestMixin, APITestCase):
     serializer = EventSerializer
 
 
-class ActivityTemplateTest(EventBasedModelTestMixin, APITestCase):
+class ActivityTemplateTests(EventBasedModelTestMixin, APITestCase):
     model = ActivityTemplate
     base_name = 'event-activitytemplate'
-    initial_count = 1
     # Creation
     data_creation = 'act_temp2_data'
     # Update/Delete
@@ -44,13 +44,34 @@ class ActivityTemplateTest(EventBasedModelTestMixin, APITestCase):
         self.assertEqual(instance.tags.count(), 2)
 
 
-class EventSpecficTagTest(EventSpecificTestMixin, APITestCase):
+class ActivityTests(EventBasedModelTestMixin, APITestCase):
+    model = Activity
+    base_name = 'event-activity'
+    # Creation
+    data_creation = 'act2_data'
+    # Update/Delete
+    instance_name = 'act1'
+    field_tested = 'title'
+    serializer = ActivityTemplateSerializer
+
+    def test_create_extra(self):
+        self.assertEqual(self.model.objects.get(id=1).tags.count(), 1)
+
+    def pre_update_extra(self, data):
+        data['tags'].append(self.tag2_data)
+        return data
+
+    def post_update_extra(self, instance):
+        self.assertEqual(instance.tags.count(), 2)
+
+
+class EventSpecficTagTests(EventSpecificTestMixin, APITestCase):
     model = ActivityTag
     root_base_name = 'activitytag'
     event_base_name = 'event-activitytag'
 
 
-class EventSpecficPlaceTest(EventSpecificTestMixin, APITestCase):
+class EventSpecficPlaceTests(EventSpecificTestMixin, APITestCase):
     model = Place
     root_base_name = 'place'
     event_base_name = 'event-place'
diff --git a/api/test_mixins.py b/api/test_mixins.py
index 9f524d7..c94a5a2 100644
--- a/api/test_mixins.py
+++ b/api/test_mixins.py
@@ -7,13 +7,13 @@ from django.urls import reverse
 from rest_framework.test import APIRequestFactory
 from rest_framework import status
 
-from event.models import Event, Place, ActivityTag, ActivityTemplate
+from event.models import Event, Place, ActivityTag, ActivityTemplate, Activity
 
 
 User = get_user_model()
 
 
-class DataBaseMixin(object):
+class DataBaseMixin():
     """
     provides a datatabse for API tests
     """
@@ -51,6 +51,19 @@ class DataBaseMixin(object):
         self.act_temp1 = ActivityTemplate.objects.create(**self.act_temp1_data)
         self.act_temp1.tags.add(self.tag1)
 
+        # Actitvity
+        self.act1_data = {'title': "act1", 'is_public': True,
+                          'beginning': timezone.now(),
+                          'end': timezone.now()+timedelta(hours=2),
+                          'remarks': "test remark", 'event': self.event1}
+        self.act2_data = {'title': "act2", 'is_public': False,
+                          "beginning": "2017-07-18T18:05:00Z",
+                          "end": "2017-07-19T18:05:00Z",
+                          'parent': None,
+                          'remarks': "test remark", 'tags': []}
+        self.act1 = Activity.objects.create(**self.act1_data)
+        self.act1.tags.add(self.tag1)
+
 
 class EventBasedModelTestMixin(DataBaseMixin):
     """
@@ -83,6 +96,7 @@ class EventBasedModelTestMixin(DataBaseMixin):
         ensure a permited user can create a new %model object using API
         """
         data = getattr(self, self.data_creation)
+        initial_count = self.model.objects.count()
 
         event_id = self.event1.id
         url = reverse('{base_name}-list'.format(base_name=self.base_name),
@@ -90,9 +104,10 @@ class EventBasedModelTestMixin(DataBaseMixin):
         self.client.force_authenticate(user=self.user1)
         response = self.client.post(url, data,
                                     format='json')
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        self.assertEqual(self.model.objects.count(), self.initial_count + 1)
-        self.assertEqual(self.model.objects.get(id=self.initial_count+1).event,
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED,
+                         msg=response.content)
+        self.assertEqual(self.model.objects.count(), initial_count + 1)
+        self.assertEqual(self.model.objects.get(id=initial_count+1).event,
                          self.event1)
 
         self.user_create_extra()
@@ -120,7 +135,8 @@ class EventBasedModelTestMixin(DataBaseMixin):
 
         self.client.force_authenticate(user=self.user1)
         response = self.client.patch(url, data, format='json')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.status_code, status.HTTP_200_OK,
+                         msg=response.content)
 
         instance.refresh_from_db()
         self.assertEqual(getattr(instance, self.field_tested), newvalue)
@@ -132,6 +148,7 @@ class EventBasedModelTestMixin(DataBaseMixin):
         ensure a permited user can delete a new %model object using API
         """
         instance = getattr(self, self.instance_name)
+        initial_count = self.model.objects.count()
 
         instance_id = instance.id
         event_id = self.event1.id
@@ -141,14 +158,15 @@ class EventBasedModelTestMixin(DataBaseMixin):
 
         self.client.force_authenticate(user=self.user1)
         response = self.client.delete(url)
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
-        self.assertEqual(self.model.objects.count(), self.initial_count - 1)
+        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT,
+                         msg=response.content)
+        self.assertEqual(self.model.objects.count(), initial_count - 1)
 
 
 # TODO rajouter la gestion des permissions dans le Mixin
 # TODO rajouter un test pour s'assurer que les personnes non
 # connectées ne peuvent pas create/update/delete
-class EventSpecificTestMixin(object):
+class EventSpecificTestMixin():
     """
     Tests is the EventSpecifics querysets are rendered correctly
     using the API
@@ -234,7 +252,8 @@ class ModelTestMixin(DataBaseMixin):
         self.client.force_authenticate(user=self.user1)
         response = self.client.post(url, data)
 
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED,
+                         msg=response.content)
         self.assertEqual(self.model.objects.count(), initial_count + 1)
 
         instance = self.model.objects.get(id=initial_count+1)
@@ -259,7 +278,8 @@ class ModelTestMixin(DataBaseMixin):
 
         self.client.force_authenticate(user=self.user1)
         response = self.client.put(url, data, format='json')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.status_code, status.HTTP_200_OK,
+                         msg=response.content)
 
         instance.refresh_from_db()
         for field, value in self.tested_fields.items():
@@ -278,5 +298,6 @@ class ModelTestMixin(DataBaseMixin):
 
         self.client.force_authenticate(user=self.user1)
         response = self.client.delete(url)
-        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT,
+                         msg=response.content)
         self.assertEqual(self.model.objects.count(), initial_count - 1)
diff --git a/api/urls.py b/api/urls.py
index 0409143..24da79a 100644
--- a/api/urls.py
+++ b/api/urls.py
@@ -1,7 +1,7 @@
 from django.conf.urls import url, include
 from rest_framework_nested.routers import SimpleRouter, NestedSimpleRouter
 from api.event.views import EventViewSet, PlaceViewSet, ActivityTagViewSet,\
-        ActivityTemplateViewSet
+        ActivityTemplateViewSet, ActivityViewSet
 
 # Create a router and register our viewsets with it.
 router = SimpleRouter()
@@ -12,9 +12,11 @@ router.register(r'activitytag', ActivityTagViewSet, 'activitytag')
 # Register nested router and register someviewsets vith it
 event_router = NestedSimpleRouter(router, r'event', lookup='event')
 event_router.register(r'place', PlaceViewSet, base_name='event-place')
-event_router.register(r'tag', ActivityTagViewSet, base_name='event-activitytag')
+event_router.register(r'tag', ActivityTagViewSet,
+                      base_name='event-activitytag')
 event_router.register(r'activitytemplate', ActivityTemplateViewSet,
                       base_name='event-activitytemplate')
+event_router.register(r'activity', ActivityViewSet, base_name='event-activity')
 
 
 # The API URLs are now determined automatically by the router.
diff --git a/communication/__init__.py b/communication/__init__.py
index e69de29..d4488d0 100644
--- a/communication/__init__.py
+++ b/communication/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'communication.apps.CommunicationConfig'
diff --git a/communication/apps.py b/communication/apps.py
index e6c488d..4b962ac 100644
--- a/communication/apps.py
+++ b/communication/apps.py
@@ -1,4 +1,6 @@
+from django.utils.translation import ugettext_lazy as _
 from django.apps import AppConfig
 
 class CommunicationConfig(AppConfig):
     name = 'communication'
+    verbose_name = _("communication")
diff --git a/equipment/__init__.py b/equipment/__init__.py
new file mode 100644
index 0000000..0a0003b
--- /dev/null
+++ b/equipment/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'equipment.apps.EquipmentConfig'
diff --git a/evenementiel/settings/common.py b/evenementiel/settings/common.py
index 8baa801..2ef622b 100644
--- a/evenementiel/settings/common.py
+++ b/evenementiel/settings/common.py
@@ -44,10 +44,6 @@ BASE_DIR = os.path.dirname(
 
 
 INSTALLED_APPS = [
-    'communication.apps.CommunicationConfig',
-    'equipment.apps.EquipmentConfig',
-    'event.apps.EventConfig',
-    'users.apps.UsersConfig',
     'shared.apps.SharedConfig',
     'django.contrib.admin',
     'django.contrib.auth',
@@ -60,6 +56,10 @@ INSTALLED_APPS = [
     'bootstrapform',
     'widget_tweaks',
     'api',
+    'communication',
+    'equipment',
+    'event',
+    'users',
 ]
 
 MIDDLEWARE_CLASSES = [
diff --git a/event/__init__.py b/event/__init__.py
index e69de29..55ece8a 100644
--- a/event/__init__.py
+++ b/event/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'event.apps.EventConfig'
diff --git a/users/__init__.py b/users/__init__.py
index e69de29..208620c 100644
--- a/users/__init__.py
+++ b/users/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'users.apps.UsersConfig'
diff --git a/users/migrations/__init__.py b/users/migrations/__init__.py
new file mode 100644
index 0000000..e69de29