diff --git a/db.sqlite3 b/db.sqlite3
index cbae0a0..09a3fee 100644
Binary files a/db.sqlite3 and b/db.sqlite3 differ
diff --git a/evolus/migrations/0003_auto_20170921_1839.py b/evolus/migrations/0003_auto_20170921_1839.py
new file mode 100644
index 0000000..1373440
--- /dev/null
+++ b/evolus/migrations/0003_auto_20170921_1839.py
@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2017-09-21 18:39
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('evolus', '0002_auto_20170920_1900'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='document',
+            name='revised_at',
+        ),
+        migrations.RemoveField(
+            model_name='historicaldocument',
+            name='revised_at',
+        ),
+        migrations.AddField(
+            model_name='document',
+            name='manager',
+            field=models.ForeignKey(default=1, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='historicaldocument',
+            name='manager',
+            field=models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='+', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='version',
+            name='authors',
+            field=models.ManyToManyField(related_name='authors', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='version',
+            name='reviewers',
+            field=models.ManyToManyField(related_name='reviewers', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='version',
+            name='revised_at',
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='version',
+            name='validators',
+            field=models.ManyToManyField(related_name='validators', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='version',
+            name='document',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='versions', to='evolus.Document'),
+        ),
+    ]
diff --git a/evolus/models.py b/evolus/models.py
index 2b5f7b7..6f4a394 100644
--- a/evolus/models.py
+++ b/evolus/models.py
@@ -5,6 +5,7 @@ This module defines the structure and properties of documents.
 from django.db import models
 from closuretree.models import ClosureModel
 from simple_history.models import HistoricalRecords
+from django.contrib.auth.models import User
 
 from jci.models import Standard
 
@@ -60,7 +61,7 @@ class Document(models.Model):
     overview = models.TextField(blank=True, null=True)
     type = models.ForeignKey(DocumentType, null=True)
     created_at = models.DateTimeField(auto_now_add=True)
-    revised_at = models.DateTimeField(null=True, blank=True)
+    manager = models.ForeignKey(User)
     history = HistoricalRecords()
 
     @property
@@ -93,6 +94,10 @@ class Version(models.Model):
     document = models.ForeignKey(Document, related_name='versions')
     major = models.PositiveIntegerField()
     published = models.OneToOneField('Revision', related_name='published_version+', null=True, blank=True)
+    revised_at = models.DateTimeField(null=True, blank=True)
+    authors = models.ManyToManyField(User, related_name='authors')
+    reviewers = models.ManyToManyField(User, related_name='reviewers')
+    validators = models.ManyToManyField(User, related_name='validators')
 
     class Meta:
         unique_together = ('document', 'major')
@@ -118,4 +123,4 @@ class Revision(models.Model):
         ordering = ('-minor',)
 
     def __str__(self):
-        return '{} rev {}'.format(self.version, self.minor)
\ No newline at end of file
+        return '{} rev {}'.format(self.version, self.minor)