diff --git a/docs/SchemaRelationnel.odg b/docs/SchemaRelationnel.odg
index 1cc6cf7..b2e2b2a 100644
Binary files a/docs/SchemaRelationnel.odg and b/docs/SchemaRelationnel.odg differ
diff --git a/stages/admin.py b/stages/admin.py
index 28a6a4c..cc886b9 100644
--- a/stages/admin.py
+++ b/stages/admin.py
@@ -2,8 +2,8 @@ from django import forms
 from django.contrib import admin
 from django.db import models
 
-from stages.models import (Student, Section, Klass, Referent, Corporation, CorpContact,
-    Domain, Period, Availability, Training)
+from stages.models import (Student, Section, Level, Klass, Referent, Corporation,
+    CorpContact, Domain, Period, Availability, Training)
 
 
 class StudentAdmin(admin.ModelAdmin):
@@ -77,8 +77,8 @@ class AvailabilityInline(admin.TabularInline):
 
 
 class PeriodAdmin(admin.ModelAdmin):
-    list_display = ('title', 'dates', 'section')
-    list_filter = ('section',)
+    list_display = ('title', 'dates', 'section', 'level')
+    list_filter = ('section', 'level')
     inlines = [AvailabilityInline]
 
 
@@ -94,6 +94,7 @@ class AvailabilityAdmin(admin.ModelAdmin):
 
 
 admin.site.register(Section)
+admin.site.register(Level)
 admin.site.register(Klass)
 admin.site.register(Student, StudentAdmin)
 admin.site.register(Referent, ReferentAdmin)
diff --git a/stages/fixtures/test_fixture.json b/stages/fixtures/test_fixture.json
index c33db51..9a24907 100644
--- a/stages/fixtures/test_fixture.json
+++ b/stages/fixtures/test_fixture.json
@@ -20,12 +20,36 @@
       "name": "EDE"
     }
   }, 
+  {
+    "pk": 1, 
+    "model": "stages.level", 
+    "fields": {
+      "name": "1"
+    }
+  }, 
+  {
+    "pk": 2, 
+    "model": "stages.level", 
+    "fields": {
+      "name": "2"
+    }
+  }, 
   {
     "pk": 1, 
     "model": "stages.klass", 
     "fields": {
       "name": "1ASE3",
-      "section": 1
+      "section": 1,
+      "level": 1
+    }
+  }, 
+  {
+    "pk": 2, 
+    "model": "stages.klass", 
+    "fields": {
+      "name": "2ASE3",
+      "section": 1,
+      "level": 2
     }
   }, 
   {
@@ -138,6 +162,7 @@
     "fields": {
       "title": "Stage de pré-sensibilisation",
       "section": 1, 
+      "level": 1,
       "start_date": "2012-11-26", 
       "end_date": "2012-12-07"
     }
diff --git a/stages/models.py b/stages/models.py
index b5abb4f..4bd5a90 100644
--- a/stages/models.py
+++ b/stages/models.py
@@ -23,9 +23,20 @@ class Section(models.Model):
         return self.name
 
 
+class Level(models.Model):
+    name = models.CharField(max_length=10, verbose_name='Nom')
+
+    class Meta:
+        verbose_name = "Niveau"
+
+    def __unicode__(self):
+        return self.name
+
+
 class Klass(models.Model):
     name = models.CharField(max_length=10, verbose_name='Nom')
     section = models.ForeignKey(Section, verbose_name='Filière')
+    level = models.ForeignKey(Level, verbose_name='Niveau')
 
     class Meta:
         verbose_name = "Classe"
@@ -131,6 +142,7 @@ class Period(models.Model):
     """ Périodes de stages """
     title = models.CharField(max_length=150, verbose_name='Titre')
     section = models.ForeignKey(Section, verbose_name='Filière')
+    level = models.ForeignKey(Level, verbose_name='Niveau')
     start_date = models.DateField(verbose_name='Date de début')
     end_date = models.DateField(verbose_name='Date de fin')
 
diff --git a/stages/views.py b/stages/views.py
index d96e3b7..0973621 100644
--- a/stages/views.py
+++ b/stages/views.py
@@ -57,11 +57,12 @@ def section_classes(request, pk):
 
 
 def period_students(request, pk):
-    """ Return all students from period's section, with corresponding Training
-    if existing (JSON)
+    """
+    Return all students from period's section and level,
+    with corresponding Training if existing (JSON)
     """
     period = get_object_or_404(Period, pk=pk)
-    students = Student.objects.filter(klass__section=period.section).order_by('last_name')
+    students = Student.objects.filter(klass__section=period.section, klass__level=period.level).order_by('last_name')
     trainings = dict((t.student_id, t.id) for t in Training.objects.filter(availability__period=period))
     data = [{
         'name': unicode(s),