diff --git a/frontend/models.py b/frontend/models.py
index 1d0a39c..5ecbb25 100644
--- a/frontend/models.py
+++ b/frontend/models.py
@@ -39,4 +39,18 @@ class CitaviProjectIdentity(models.Model):
         citavi_repr = person_mapper.get_representation_for_citavi_identity(self)
         if self.preferred == True:
             citavi_repr = citavi_repr + u" <preferred>"
-        return citavi_repr
\ No newline at end of file
+        return citavi_repr
+
+#  TODO: Figure out how to realize this step by step. PROPERLY!
+
+class HSHIdentity(models.Model):
+    """ Model representing existing HSH identities. """
+    global_identity = models.ForeignKey(PersonGlobalIdentity, blank=True, null=True, db_index=True)
+    preferred = models.BooleanField()
+
+
+class VIVOIdentity(models.Model):
+    """ Model representing existing VIVO identities. """
+    global_identity = models.ForeignKey(PersonGlobalIdentity, blank=True, null=True, db_index=True)
+    preferred = models.BooleanField()
+