diff --git a/conntrackt/models.py b/conntrackt/models.py
--- a/conntrackt/models.py
+++ b/conntrackt/models.py
@@ -1,5 +1,6 @@
 # Django imports.
 from django.core.exceptions import ValidationError
+from django.core.urlresolvers import reverse
 from django.db import models
 
 
@@ -15,7 +16,7 @@ class Project(models.Model):
       description - Free-form description of the project.
     """
 
-    name = models.CharField(max_length=100)
+    name = models.CharField(max_length=100, unique=True)
     description = models.TextField(blank=True)
 
     class Meta:
@@ -29,6 +30,13 @@ class Project(models.Model):
 
         return self.name
 
+    def get_absolute_url(self):
+        """
+        Return absolute URL for viewing a single project.
+        """
+
+        return reverse("project", kwargs={'pk': self.pk})
+
 
 class Location(models.Model):
     """
@@ -54,7 +62,7 @@ class Location(models.Model):
       description - Free-form description of a location.
     """
 
-    name = models.CharField(max_length=100)
+    name = models.CharField(max_length=100, unique=True)
     description = models.TextField(blank=True)
 
     def __unicode__(self):
@@ -92,15 +100,11 @@ class Entity(models.Model):
     location = models.ForeignKey(Location)
 
     class Meta:
-        """
-        Overrides some of the default parameters used by Django for this model.
+        # Fix the plural form used by Django.
+        verbose_name_plural = 'entities'
+        # Enforce uniqueness of entity name in a project.
+        unique_together = ("name", "project")
 
-        Properties:
-          verbose_name_plural - Changes the way Django Admin displays the model
-          name in plural.
-        """
-
-        verbose_name_plural = 'entities'
 
     def __unicode__(self):
         """
@@ -139,6 +143,13 @@ class Entity(models.Model):
 
         return communications
 
+    def get_absolute_url(self):
+        """
+        Return absolute URL for viewing a single entity.
+        """
+
+        return reverse("entity", kwargs={'pk': self.pk})
+
 
 class Interface(models.Model):
     """
@@ -166,6 +177,10 @@ class Interface(models.Model):
     address = models.IPAddressField()
     netmask = models.IPAddressField(default='255.255.255.255')
 
+    class Meta:
+        # Enforce uniqueness of interface name in an entity.
+        unique_together = ("name", "entity")
+
     def __unicode__(self):
         """
         Returns:
@@ -225,7 +240,7 @@ class Communication(models.Model):
     description = models.TextField(blank=True)
 
     class Meta:
-        # Enfoce uniqueness of communication.
+        # Enforce uniqueness of communication.
         unique_together = ("source", "destination", "protocol", "port")
 
     def __unicode__(self):