diff --git a/tempest/api/identity/admin/v3/test_groups.py b/tempest/api/identity/admin/v3/test_groups.py
index d5af4b4..f25ed98 100644
--- a/tempest/api/identity/admin/v3/test_groups.py
+++ b/tempest/api/identity/admin/v3/test_groups.py
@@ -25,7 +25,7 @@
         name = data_utils.rand_name('Group')
         description = data_utils.rand_name('Description')
         group = self.groups_client.create_group(
-            name, description=description)['group']
+            name=name, description=description)['group']
         self.addCleanup(self.groups_client.delete_group, group['id'])
         self.assertEqual(group['name'], name)
         self.assertEqual(group['description'], description)
@@ -46,7 +46,7 @@
     @test.idempotent_id('1598521a-2f36-4606-8df9-30772bd51339')
     def test_group_users_add_list_delete(self):
         name = data_utils.rand_name('Group')
-        group = self.groups_client.create_group(name)['group']
+        group = self.groups_client.create_group(name=name)['group']
         self.addCleanup(self.groups_client.delete_group, group['id'])
         # add user into group
         users = []
@@ -77,7 +77,7 @@
         groups = []
         for i in range(2):
             name = data_utils.rand_name('Group')
-            group = self.groups_client.create_group(name)['group']
+            group = self.groups_client.create_group(name=name)['group']
             groups.append(group)
             self.addCleanup(self.groups_client.delete_group, group['id'])
             self.groups_client.add_group_user(group['id'], user['id'])
@@ -95,7 +95,7 @@
             name = data_utils.rand_name('Group')
             description = data_utils.rand_name('Description')
             group = self.groups_client.create_group(
-                name, description=description)['group']
+                name=name, description=description)['group']
             self.addCleanup(self.groups_client.delete_group, group['id'])
             group_ids.append(group['id'])
         # List and Verify Groups
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index 524340c..eb6b7ee 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -40,7 +40,7 @@
             description=data_utils.rand_name('project-desc'),
             domain_id=cls.domain['id'])['project']
         cls.group_body = cls.groups_client.create_group(
-            data_utils.rand_name('Group'), project_id=cls.project['id'],
+            name=data_utils.rand_name('Group'), project_id=cls.project['id'],
             domain_id=cls.domain['id'])['group']
         cls.user_body = cls.client.create_user(
             u_name, description=u_desc, password=cls.u_password,
diff --git a/tempest/services/identity/v3/json/groups_client.py b/tempest/services/identity/v3/json/groups_client.py
index 5bd610d..2f302ae 100644
--- a/tempest/services/identity/v3/json/groups_client.py
+++ b/tempest/services/identity/v3/json/groups_client.py
@@ -13,6 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+"""
+http://developer.openstack.org/api-ref-identity-v3.html#groups-v3
+"""
+
 from oslo_serialization import jsonutils as json
 
 from tempest.common import service_client
@@ -21,18 +25,13 @@
 class GroupsClient(service_client.ServiceClient):
     api_version = "v3"
 
-    def create_group(self, name, **kwargs):
-        """Creates a group."""
-        description = kwargs.get('description', None)
-        domain_id = kwargs.get('domain_id', 'default')
-        project_id = kwargs.get('project_id', None)
-        post_body = {
-            'description': description,
-            'domain_id': domain_id,
-            'project_id': project_id,
-            'name': name
-        }
-        post_body = json.dumps({'group': post_body})
+    def create_group(self, **kwargs):
+        """Creates a group.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref-identity-v3.html#createGroup
+        """
+        post_body = json.dumps({'group': kwargs})
         resp, body = self.post('groups', post_body)
         self.expected_success(201, resp.status)
         body = json.loads(body)
@@ -53,15 +52,12 @@
         return service_client.ResponseBody(resp, body)
 
     def update_group(self, group_id, **kwargs):
-        """Updates a group."""
-        body = self.get_group(group_id)['group']
-        name = kwargs.get('name', body['name'])
-        description = kwargs.get('description', body['description'])
-        post_body = {
-            'name': name,
-            'description': description
-        }
-        post_body = json.dumps({'group': post_body})
+        """Updates a group.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref-identity-v3.html#updateGroup
+        """
+        post_body = json.dumps({'group': kwargs})
         resp, body = self.patch('groups/%s' % group_id, post_body)
         self.expected_success(200, resp.status)
         body = json.loads(body)