diff --git a/plstackapi/core/api/images.py b/plstackapi/core/api/images.py
index ef197a6..8fd6141 100644
--- a/plstackapi/core/api/images.py
+++ b/plstackapi/core/api/images.py
@@ -8,11 +8,11 @@
     if isinstance(filter, StringTypes) and filter.isdigit():
         filter = int(filter)
     if isinstance(filter, int):
-        images = image.objects.filter(id=filter)
+        images = Image.objects.filter(id=filter)
     elif isinstance(filter, StringTypes):
-        images = image.objects.filter(name=filter)
+        images = Image.objects.filter(name=filter)
     elif isinstance(filter, dict):
-        images = image.objects.filter(**filter)
+        images = Image.objects.filter(**filter)
     else:
         images = []
     return images
diff --git a/plstackapi/core/api/sites.py b/plstackapi/core/api/sites.py
index daf8fa1..b8c463d 100644
--- a/plstackapi/core/api/sites.py
+++ b/plstackapi/core/api/sites.py
@@ -11,7 +11,7 @@
     if isinstance(filter, int):
         sites = Site.objects.filter(id=filter)
     elif isinstance(filter, StringTypes):
-        sites = Site.objects.filter(name=filter)
+        sites = Site.objects.filter(login_base=filter)
     elif isinstance(filter, dict):
         sites = Site.objects.filter(**filter)
     else:
@@ -55,7 +55,7 @@
 
 def get_sites(auth, filter={}):
     client = auth_check(auth)
-    sites = _get_sites(id)
+    sites = _get_sites(filter)
     return sites             
         
 
diff --git a/plstackapi/core/api/slices.py b/plstackapi/core/api/slices.py
index bfbc4d9..1072c07 100644
--- a/plstackapi/core/api/slices.py
+++ b/plstackapi/core/api/slices.py
@@ -1,3 +1,4 @@
+import re
 from types import StringTypes
 from plstackapi.openstack.client import OpenStackClient
 from plstackapi.openstack.driver import OpenStackDriver
@@ -5,6 +6,19 @@
 from plstackapi.core.models import Slice
 from plstackapi.core.api.sites import _get_sites
 
+def validate_name(name):
+    # N.B.: Responsibility of the caller to ensure that login_base
+        # portion of the slice name corresponds to a valid site, if
+        # desired.
+
+        # 1. Lowercase.
+        # 2. Begins with login_base (letters or numbers).
+        # 3. Then single underscore after login_base.
+        # 4. Then letters, numbers, or underscores.
+        good_name = r'^[a-z0-9]+_[a-zA-Z0-9_]+$'
+        if not name or \
+           not re.match(good_name, name):
+            raise Exception, "Invalid slice name: %s" % name
 
 def _get_slices(filter):
     if isinstance(filter, StringTypes) and filter.isdigit():
@@ -22,9 +36,12 @@
  
 def add_slice(auth, fields):
     driver = OpenStackDriver(client = auth_check(auth))
-    sites = _get_sites(fields.get('site')) 
+    validate_name(fields.get('name'))
+    login_base = fields['name'][:fields['name'].find('_')]
+    sites = _get_sites(login_base) 
     if sites: fields['site'] = sites[0]     
     slice = Slice(**fields)
+   
     # create tenant
     nova_fields = {'tenant_name': slice.name,
                    'description': slice.description,
diff --git a/plstackapi/core/api/slivers.py b/plstackapi/core/api/slivers.py
index f3807ab..0fcc191 100644
--- a/plstackapi/core/api/slivers.py
+++ b/plstackapi/core/api/slivers.py
@@ -27,7 +27,7 @@
 def add_sliver(auth, fields):
     driver = OpenStackDriver(client = auth_check(auth))
     
-    flavors = _get_flavor(fields.get('flavor'))
+    flavors = _get_flavors(fields.get('flavor'))
     if flavors: fields['flavor'] = flavors[0]     
     images = _get_images(fields.get('image'))
     if images: fields['image'] = images[0]     
@@ -35,8 +35,8 @@
     if keys: fields['key'] = keys[0]     
     slices = _get_slices(fields.get('slice'))
     if slices: fields['slice'] = slices[0]     
-    deployment_networks = _get_deployment_networks(field.get('deployment_network'))
-    if deployment_networks: fields['deployment_network'] = deployment_networks[0]     
+    deployment_networks = _get_deployment_networks(fields.get('deploymentNetwork'))
+    if deployment_networks: fields['deploymentNetwork'] = deployment_networks[0]     
     nodes = _get_nodes(fields.get('node'))
     if nodes: fields['node'] = nodess[0]     
     
diff --git a/plstackapi/core/api/subnets.py b/plstackapi/core/api/subnets.py
index 33a0269..6ef051e 100644
--- a/plstackapi/core/api/subnets.py
+++ b/plstackapi/core/api/subnets.py
@@ -11,7 +11,11 @@
     if isinstance(filter, int):
         subnets = Subnet.objects.filter(id=filter)
     elif isinstance(filter, StringTypes):
-        subnets = Subnet.objects.filter(name=filter)
+        # the name is the subnet's slice's name
+        slices = _get_slices(filter)
+        slice = None
+        if slices: slice=slices[0]
+        subnets = Subnet.objects.filter(slice=slice)
     elif isinstance(filter, dict):
         subnets = Subnet.objects.filter(**filter)
     else:
@@ -20,11 +24,11 @@
 
 def add_subnet(auth, fields):
     driver = OpenStackDriver(client = auth_check(auth))
-    slices = _get_slice(fields.get('slice')) 
+    slices = _get_slices(fields.get('slice')) 
     if slices: fields['slice'] = slices[0]     
     subnet = Subnet(**fields)
     # create quantum subnet
-    subnet = driver.create_subnet(network_name=subnet.name,
+    subnet = driver.create_subnet(network_name=subnet.slice.name,
                                   cidr_ip = subnet.cidr,
                                   ip_version=subnet.ip_version,
                                   start = subnet.start,
diff --git a/plstackapi/core/api/users.py b/plstackapi/core/api/users.py
index b2ba681..7483c37 100644
--- a/plstackapi/core/api/users.py
+++ b/plstackapi/core/api/users.py
@@ -11,7 +11,7 @@
     if isinstance(filter, int):
         users = User.objects.filter(id=filter)
     elif isinstance(filter, StringTypes):
-        users = User.objects.filter(role_type=filter)
+        users = User.objects.filter(email=filter)
     elif isinstance(filter, dict):
         users = User.objects.filter(**filter)
     else: