diff --git a/jdav_web/material/admin.py b/jdav_web/material/admin.py
index 886b969..9f435b3 100644
--- a/jdav_web/material/admin.py
+++ b/jdav_web/material/admin.py
@@ -1,12 +1,22 @@
 from django.contrib import admin
 
-from .models import MaterialPart
+from .models import MaterialPart, Ownership
+
 
 # Register your models here.
+class OwnershipInline(admin.StackedInline):
+    """
+    This shows the ownership selection directly in the MaterialPart edit
+    view
+    """
+    model = Ownership
+    extra = 0
 
 
 class MaterialAdmin(admin.ModelAdmin):
+    """Edit view of a MaterialPart"""
     fields = ['name', 'buy_date']
     list_display = ('name', 'buy_date', 'should_be_replaced')
+    inlines = [OwnershipInline]
 
 admin.site.register(MaterialPart, MaterialAdmin)
diff --git a/jdav_web/material/migrations/0001_initial.py b/jdav_web/material/migrations/0001_initial.py
index ae3a51b..7f71953 100644
--- a/jdav_web/material/migrations/0001_initial.py
+++ b/jdav_web/material/migrations/0001_initial.py
@@ -1,8 +1,9 @@
 # -*- coding: utf-8 -*-
-# Generated by Django 1.10.2 on 2016-10-17 15:18
+# Generated by Django 1.10.2 on 2016-10-18 19:07
 from __future__ import unicode_literals
 
 from django.db import migrations, models
+import django.db.models.deletion
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
+        ('members', '0004_auto_20161018_1744'),
     ]
 
     operations = [
@@ -18,7 +20,16 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('name', models.CharField(max_length=30)),
-                ('buy_date', models.DateTimeField(verbose_name='purchase date')),
+                ('buy_date', models.DateField(verbose_name='purchase date')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Ownership',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('count', models.IntegerField(default=1)),
+                ('material', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='material.MaterialPart')),
+                ('owner', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='members.Member')),
             ],
         ),
     ]
diff --git a/jdav_web/material/migrations/0002_auto_20161017_1522.py b/jdav_web/material/migrations/0002_auto_20161017_1522.py
deleted file mode 100644
index d3dfed0..0000000
--- a/jdav_web/material/migrations/0002_auto_20161017_1522.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.10.2 on 2016-10-17 15:22
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('material', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='materialpart',
-            name='buy_date',
-            field=models.DateField(verbose_name='purchase date'),
-        ),
-    ]
diff --git a/jdav_web/material/models.py b/jdav_web/material/models.py
index 2b24ab9..5749e97 100644
--- a/jdav_web/material/models.py
+++ b/jdav_web/material/models.py
@@ -9,14 +9,19 @@ MAX_TIME_MATERIAL = 5
 
 # Create your models here.
 class MaterialPart(models.Model):
+    """
+    Represents one part of material, which is owned (and stored) by different
+    members of the association (Ownership)
+    """
     name = models.CharField(max_length=30)
     buy_date = models.DateField('purchase date')
-    # owner = models.ForeignKey(Leiter)  to be added later when there are user
 
-    def __repr__(self):
+    def __str__(self):
+        """String representation"""
         return self.name
 
     def should_be_replaced(self):
+        """Returns wether the part should be replaced cause of age"""
         buy_time = timezone.make_aware(datetime.combine(self.buy_date,
                                                         datetime.min.time()))
         return yearsago(MAX_TIME_MATERIAL) >= buy_time
@@ -26,7 +31,19 @@ class MaterialPart(models.Model):
     should_be_replaced.short_description = 'Should be replaced?'
 
 
+class Ownership(models.Model):
+    """Represents the connection between a MaterialPart and a Member"""
+    material = models.ForeignKey(MaterialPart, on_delete=models.CASCADE)
+    owner = models.ForeignKey('members.Member')
+    count = models.IntegerField(default=1)
+
+    def __str__(self):
+        """String representation"""
+        return str(self.owner)
+
+
 def yearsago(years, from_date=None):
+    """Function to return the date with a delta of years in the past"""
     if from_date is None:
         from_date = timezone.now()
     try:
diff --git a/jdav_web/members/models.py b/jdav_web/members/models.py
index 0fbb749..fee5bd0 100644
--- a/jdav_web/members/models.py
+++ b/jdav_web/members/models.py
@@ -2,21 +2,31 @@ from django.db import models
 
 
 class Group(models.Model):
+    """
+    Represents one group of the association
+    e.g: J1, J2, Jugendleiter, etc.
+    """
     name = models.CharField(max_length=20)  # name of group e.g: J1 etc.
     min_age = models.IntegerField(default=5)  # in years
 
     def __str__(self):
-        return "Group {0}".format(self.name)
+        """String representation"""
+        return self.name
 
 
 class Member(models.Model):
+    """
+    Represents a member of the association
+    Might be a member of different groups: e.g. J1, J2, Jugendleiter, etc.
+    """
     prename = models.CharField(max_length=20)
     lastname = models.CharField(max_length=20)
     email = models.EmailField(max_length=100, default="")
     birth_date = models.DateField('birth date')  # to determine the age
     group = models.ManyToManyField(Group)
 
-    def __repr__(self):
+    def __str__(self):
+        """String representation"""
         return self.name
 
     @property