diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index dfcbaba..4c977a3 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -115,6 +115,24 @@
 # to use for running tests (string value)
 #test_accounts_file=etc/accounts.yaml
 
+# Allows test cases to create/destroy tenants and users. This
+# option requires that OpenStack Identity API admin
+# credentials are known. If false, isolated test cases and
+# parallel execution, can still be achieved configuring a list
+# of test accounts (boolean value)
+# Deprecated group/name - [compute]/allow_tenant_isolation
+# Deprecated group/name - [orchestration]/allow_tenant_isolation
+#allow_tenant_isolation=false
+
+# If set to True it enables the Accounts provider, which locks
+# credentials to allow for parallel execution with pre-
+# provisioned accounts. It can only be used to run tests that
+# ensure credentials cleanup happens. It requires at least `2
+# * CONC` distinct accounts configured in
+# `test_accounts_file`, with CONC == the number of concurrent
+# test processes. (boolean value)
+#locking_credentials_provider=false
+
 
 [baremetal]
 
@@ -229,12 +247,6 @@
 # Options defined in tempest.config
 #
 
-# Allows test cases to create/destroy tenants and users. This
-# option enables isolated test cases and better parallel
-# execution, but also requires that OpenStack Identity API
-# admin credentials are known. (boolean value)
-#allow_tenant_isolation=false
-
 # Valid primary image reference to be used in tests. This is a
 # required option (string value)
 #image_ref=<None>
@@ -356,12 +368,6 @@
 # value)
 #floating_ip_range=10.0.0.0/29
 
-# Allows test cases to create/destroy tenants and users. This
-# option enables isolated test cases and better parallel
-# execution, but also requires that OpenStack Identity API
-# admin credentials are known. (boolean value)
-#allow_tenant_isolation=false
-
 # Time in seconds between build status checks. (integer value)
 #build_interval=1
 
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 6c93d33..6496176 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -44,9 +44,9 @@
 
         # TODO(andreaf) WE should care also for the alt_manager here
         # but only once client lazy load in the manager is done
-        os = cls.get_client_manager()
+        cls.os = cls.get_client_manager()
+        cls.multi_user = cls.check_multi_user()
 
-        cls.os = os
         cls.build_interval = CONF.compute.build_interval
         cls.build_timeout = CONF.compute.build_timeout
         cls.ssh_user = CONF.compute.ssh_user
@@ -58,7 +58,6 @@
         cls.image_ssh_password = CONF.compute.image_ssh_password
         cls.servers = []
         cls.images = []
-        cls.multi_user = cls.get_multi_user()
         cls.security_groups = []
         cls.server_groups = []
 
@@ -118,27 +117,12 @@
             raise exceptions.InvalidConfiguration(message=msg)
 
     @classmethod
-    def get_multi_user(cls):
-        multi_user = True
-        # Determine if there are two regular users that can be
-        # used in testing. If the test cases are allowed to create
-        # users (config.compute.allow_tenant_isolation is true,
-        # then we allow multi-user.
-        if not CONF.compute.allow_tenant_isolation:
-            user1 = CONF.identity.username
-            user2 = CONF.identity.alt_username
-            if not user2 or user1 == user2:
-                multi_user = False
-            else:
-                user2_password = CONF.identity.alt_password
-                user2_tenant_name = CONF.identity.alt_tenant_name
-                if not user2_password or not user2_tenant_name:
-                    msg = ("Alternate user specified but not alternate "
-                           "tenant or password: alt_tenant_name=%s "
-                           "alt_password=%s"
-                           % (user2_tenant_name, user2_password))
-                    raise exceptions.InvalidConfiguration(msg)
-        return multi_user
+    def check_multi_user(cls):
+        # We have a list of accounts now, so just checking if the list is gt 2
+        if not cls.isolated_creds.is_multi_user():
+            msg = "Not enough users available for multi-user testing"
+            raise exceptions.InvalidConfiguration(msg)
+        return True
 
     @classmethod
     def clear_servers(cls):
@@ -390,19 +374,14 @@
     @classmethod
     def resource_setup(cls):
         super(BaseComputeAdminTest, cls).resource_setup()
-        if (CONF.compute.allow_tenant_isolation or
-            cls.force_tenant_isolation is True):
+        try:
             creds = cls.isolated_creds.get_admin_creds()
-            cls.os_adm = clients.Manager(credentials=creds,
-                                         interface=cls._interface)
-        else:
-            try:
-                cls.os_adm = clients.ComputeAdminManager(
-                    interface=cls._interface)
-            except exceptions.InvalidCredentials:
-                msg = ("Missing Compute Admin API credentials "
-                       "in configuration.")
-                raise cls.skipException(msg)
+            cls.os_adm = clients.Manager(
+                credentials=creds, interface=cls._interface)
+        except NotImplementedError:
+            msg = ("Missing Compute Admin API credentials in configuration.")
+            raise cls.skipException(msg)
+
         if cls._api_version == 2:
             cls.availability_zone_admin_client = (
                 cls.os_adm.availability_zone_client)
diff --git a/tempest/api/compute/servers/test_list_server_filters.py b/tempest/api/compute/servers/test_list_server_filters.py
index 98fe387..e660f00 100644
--- a/tempest/api/compute/servers/test_list_server_filters.py
+++ b/tempest/api/compute/servers/test_list_server_filters.py
@@ -69,12 +69,12 @@
         resp, cls.s3 = cls.create_test_server(name=cls.s3_name,
                                               flavor=cls.flavor_ref_alt,
                                               wait_until='ACTIVE')
-        if (CONF.service_available.neutron and
-                CONF.compute.allow_tenant_isolation):
-            network = cls.isolated_creds.get_primary_network()
-            cls.fixed_network_name = network['name']
-        else:
-            cls.fixed_network_name = CONF.compute.fixed_network_name
+
+        cls.fixed_network_name = CONF.compute.fixed_network_name
+        if CONF.service_available.neutron:
+            if hasattr(cls.isolated_creds, 'get_primary_network'):
+                network = cls.isolated_creds.get_primary_network()
+                cls.fixed_network_name = network['name']
 
     @utils.skip_unless_attr('multiple_images', 'Only one image found')
     @test.attr(type='gate')
diff --git a/tempest/api/compute/servers/test_servers_negative.py b/tempest/api/compute/servers/test_servers_negative.py
index b86ee06..0349260 100644
--- a/tempest/api/compute/servers/test_servers_negative.py
+++ b/tempest/api/compute/servers/test_servers_negative.py
@@ -45,10 +45,7 @@
     def resource_setup(cls):
         super(ServersNegativeTestJSON, cls).resource_setup()
         cls.client = cls.servers_client
-        if CONF.compute.allow_tenant_isolation:
-            cls.alt_os = clients.Manager(cls.isolated_creds.get_alt_creds())
-        else:
-            cls.alt_os = clients.AltManager()
+        cls.alt_os = clients.Manager(cls.isolated_creds.get_alt_creds())
         cls.alt_client = cls.alt_os.servers_client
         resp, server = cls.create_test_server(wait_until='ACTIVE')
         cls.server_id = server['id']
diff --git a/tempest/api/compute/test_authorization.py b/tempest/api/compute/test_authorization.py
index 015d9f5..175f008 100644
--- a/tempest/api/compute/test_authorization.py
+++ b/tempest/api/compute/test_authorization.py
@@ -45,12 +45,8 @@
         cls.keypairs_client = cls.os.keypairs_client
         cls.security_client = cls.os.security_groups_client
 
-        if CONF.compute.allow_tenant_isolation:
-            creds = cls.isolated_creds.get_alt_creds()
-            cls.alt_manager = clients.Manager(credentials=creds)
-        else:
-            # Use the alt_XXX credentials in the config file
-            cls.alt_manager = clients.AltManager()
+        creds = cls.isolated_creds.get_alt_creds()
+        cls.alt_manager = clients.Manager(credentials=creds)
 
         cls.alt_client = cls.alt_manager.servers_client
         cls.alt_images_client = cls.alt_manager.images_client
diff --git a/tempest/api/compute/v3/servers/test_list_server_filters.py b/tempest/api/compute/v3/servers/test_list_server_filters.py
index 209d293..73844cf 100644
--- a/tempest/api/compute/v3/servers/test_list_server_filters.py
+++ b/tempest/api/compute/v3/servers/test_list_server_filters.py
@@ -70,12 +70,11 @@
                                               flavor=cls.flavor_ref_alt,
                                               wait_until='ACTIVE')
 
-        if (CONF.service_available.neutron and
-                CONF.compute.allow_tenant_isolation):
-            network = cls.isolated_creds.get_primary_network()
-            cls.fixed_network_name = network['name']
-        else:
-            cls.fixed_network_name = CONF.compute.fixed_network_name
+        cls.fixed_network_name = CONF.compute.fixed_network_name
+        if CONF.service_available.neutron:
+            if hasattr(cls.isolated_creds, 'get_primary_network'):
+                network = cls.isolated_creds.get_primary_network()
+                cls.fixed_network_name = network['name']
 
     @utils.skip_unless_attr('multiple_images', 'Only one image found')
     @test.attr(type='gate')
diff --git a/tempest/api/compute/v3/servers/test_servers_negative.py b/tempest/api/compute/v3/servers/test_servers_negative.py
index 30ac0ac..4b1fe04 100644
--- a/tempest/api/compute/v3/servers/test_servers_negative.py
+++ b/tempest/api/compute/v3/servers/test_servers_negative.py
@@ -45,10 +45,7 @@
     def resource_setup(cls):
         super(ServersNegativeV3Test, cls).resource_setup()
         cls.client = cls.servers_client
-        if CONF.compute.allow_tenant_isolation:
-            cls.alt_os = clients.Manager(cls.isolated_creds.get_alt_creds())
-        else:
-            cls.alt_os = clients.AltManager()
+        cls.alt_os = clients.Manager(cls.isolated_creds.get_alt_creds())
         cls.alt_client = cls.alt_os.servers_v3_client
         resp, server = cls.create_test_server(wait_until='ACTIVE')
         cls.server_id = server['id']
diff --git a/tempest/api/image/base.py b/tempest/api/image/base.py
index 08767e3..74baba6 100644
--- a/tempest/api/image/base.py
+++ b/tempest/api/image/base.py
@@ -41,10 +41,7 @@
         if not CONF.service_available.glance:
             skip_msg = ("%s skipped as glance is not available" % cls.__name__)
             raise cls.skipException(skip_msg)
-        if CONF.compute.allow_tenant_isolation:
-            cls.os = clients.Manager(cls.isolated_creds.get_primary_creds())
-        else:
-            cls.os = clients.Manager()
+        cls.os = clients.Manager(cls.isolated_creds.get_primary_creds())
 
     @classmethod
     def resource_cleanup(cls):
@@ -91,10 +88,7 @@
     @classmethod
     def resource_setup(cls):
         super(BaseV1ImageMembersTest, cls).resource_setup()
-        if CONF.compute.allow_tenant_isolation:
-            cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds())
-        else:
-            cls.os_alt = clients.AltManager()
+        cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds())
 
         cls.alt_img_cli = cls.os_alt.image_client
         cls.alt_tenant_id = cls.alt_img_cli.tenant_id
@@ -126,11 +120,8 @@
     @classmethod
     def resource_setup(cls):
         super(BaseV2MemberImageTest, cls).resource_setup()
-        if CONF.compute.allow_tenant_isolation:
-            creds = cls.isolated_creds.get_alt_creds()
-            cls.os_alt = clients.Manager(creds)
-        else:
-            cls.os_alt = clients.AltManager()
+        creds = cls.isolated_creds.get_alt_creds()
+        cls.os_alt = clients.Manager(creds)
         cls.os_img_client = cls.os.image_client_v2
         cls.alt_img_client = cls.os_alt.image_client_v2
         cls.alt_tenant_id = cls.alt_img_client.tenant_id
diff --git a/tempest/api/network/base.py b/tempest/api/network/base.py
index d9b2848..91e3e14 100644
--- a/tempest/api/network/base.py
+++ b/tempest/api/network/base.py
@@ -366,19 +366,15 @@
     @classmethod
     def resource_setup(cls):
         super(BaseAdminNetworkTest, cls).resource_setup()
-        admin_username = CONF.compute_admin.username
-        admin_password = CONF.compute_admin.password
-        admin_tenant = CONF.compute_admin.tenant_name
-        if not (admin_username and admin_password and admin_tenant):
+
+        try:
+            creds = cls.isolated_creds.get_admin_creds()
+            cls.os_adm = clients.Manager(
+                credentials=creds, interface=cls._interface)
+        except NotImplementedError:
             msg = ("Missing Administrative Network API credentials "
                    "in configuration.")
             raise cls.skipException(msg)
-        if (CONF.compute.allow_tenant_isolation or
-            cls.force_tenant_isolation is True):
-            cls.os_adm = clients.Manager(cls.isolated_creds.get_admin_creds(),
-                                         interface=cls._interface)
-        else:
-            cls.os_adm = clients.ComputeAdminManager(interface=cls._interface)
         cls.admin_client = cls.os_adm.network_client
 
     @classmethod
diff --git a/tempest/api/object_storage/base.py b/tempest/api/object_storage/base.py
index 6a5fd3d..2e39cf9 100644
--- a/tempest/api/object_storage/base.py
+++ b/tempest/api/object_storage/base.py
@@ -36,18 +36,12 @@
             raise cls.skipException(skip_msg)
         cls.isolated_creds = isolated_creds.IsolatedCreds(
             cls.__name__, network_resources=cls.network_resources)
-        if CONF.compute.allow_tenant_isolation:
-            # Get isolated creds for normal user
-            cls.os = clients.Manager(cls.isolated_creds.get_primary_creds())
-            # Get isolated creds for admin user
-            cls.os_admin = clients.Manager(
-                cls.isolated_creds.get_admin_creds())
-            # Get isolated creds for alt user
-            cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds())
-        else:
-            cls.os = clients.Manager()
-            cls.os_admin = clients.AdminManager()
-            cls.os_alt = clients.AltManager()
+        # Get isolated creds for normal user
+        cls.os = clients.Manager(cls.isolated_creds.get_primary_creds())
+        # Get isolated creds for admin user
+        cls.os_admin = clients.Manager(cls.isolated_creds.get_admin_creds())
+        # Get isolated creds for alt user
+        cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds())
 
         cls.object_client = cls.os.object_client
         cls.container_client = cls.os.container_client
diff --git a/tempest/api/volume/admin/test_volume_quotas.py b/tempest/api/volume/admin/test_volume_quotas.py
index 7e24fa4..ece4299 100644
--- a/tempest/api/volume/admin/test_volume_quotas.py
+++ b/tempest/api/volume/admin/test_volume_quotas.py
@@ -71,7 +71,8 @@
 
     @test.attr(type='gate')
     def test_show_quota_usage(self):
-        _, quota_usage = self.quotas_client.get_quota_usage(self.adm_tenant)
+        _, quota_usage = self.quotas_client.get_quota_usage(
+            self.os_adm.credentials.tenant_name)
         for key in QUOTA_KEYS:
             self.assertIn(key, quota_usage)
             for usage_key in QUOTA_USAGE_KEYS:
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index 7f5361d..78fd61d 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -154,19 +154,14 @@
     @classmethod
     def resource_setup(cls):
         super(BaseVolumeAdminTest, cls).resource_setup()
-        cls.adm_user = CONF.identity.admin_username
-        cls.adm_pass = CONF.identity.admin_password
-        cls.adm_tenant = CONF.identity.admin_tenant_name
-        if not all((cls.adm_user, cls.adm_pass, cls.adm_tenant)):
-            msg = ("Missing Volume Admin API credentials "
-                   "in configuration.")
-            raise cls.skipException(msg)
 
-        if CONF.compute.allow_tenant_isolation:
-            cls.os_adm = clients.Manager(cls.isolated_creds.get_admin_creds(),
-                                         interface=cls._interface)
-        else:
-            cls.os_adm = clients.AdminManager(interface=cls._interface)
+        try:
+            cls.adm_creds = cls.isolated_creds.get_admin_creds()
+            cls.os_adm = clients.Manager(
+                credentials=cls.adm_creds, interface=cls._interface)
+        except NotImplementedError:
+            msg = "Missing Volume Admin API credentials in configuration."
+            raise cls.skipException(msg)
 
         cls.qos_specs = []
 
diff --git a/tempest/api/volume/test_volume_transfers.py b/tempest/api/volume/test_volume_transfers.py
index 90ac9c1..fe217c1 100644
--- a/tempest/api/volume/test_volume_transfers.py
+++ b/tempest/api/volume/test_volume_transfers.py
@@ -30,15 +30,16 @@
         super(VolumesV2TransfersTest, cls).resource_setup()
 
         # Add another tenant to test volume-transfer
-        if CONF.compute.allow_tenant_isolation:
-            cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds(),
-                                         interface=cls._interface)
-            # Add admin tenant to cleanup resources
-            cls.os_adm = clients.Manager(cls.isolated_creds.get_admin_creds(),
-                                         interface=cls._interface)
-        else:
-            cls.os_alt = clients.AltManager()
-            cls.os_adm = clients.ComputeAdminManager(interface=cls._interface)
+        cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds(),
+                                     interface=cls._interface)
+        # Add admin tenant to cleanup resources
+        try:
+            creds = cls.isolated_creds.get_admin_creds()
+            cls.os_adm = clients.Manager(
+                credentials=creds, interface=cls._interface)
+        except NotImplementedError:
+            msg = "Missing Volume Admin API credentials in configuration."
+            raise cls.skipException(msg)
 
         cls.client = cls.volumes_client
         cls.alt_client = cls.os_alt.volumes_client
diff --git a/tempest/common/accounts.py b/tempest/common/accounts.py
index 7423c17..88e8ced 100644
--- a/tempest/common/accounts.py
+++ b/tempest/common/accounts.py
@@ -58,7 +58,12 @@
         return hash_dict
 
     def is_multi_user(self):
-        return len(self.hash_dict) > 1
+        # Default credentials is not a valid option with locking Account
+        if self.use_default_creds:
+            raise exceptions.InvalidConfiguration(
+                "Account file %s doesn't exist" % CONF.auth.test_accounts_file)
+        else:
+            return len(self.hash_dict) > 1
 
     def _create_hash_file(self, hash_string):
         path = os.path.join(os.path.join(self.accounts_dir, hash_string))
@@ -144,6 +149,21 @@
     to preserve the current behaviour of the serial tempest run.
     """
 
+    def is_multi_user(self):
+        if self.use_default_creds:
+            # Verify that the configured users are valid and distinct
+            try:
+                user = self.get_primary_creds()
+                alt_user = self.get_alt_creds()
+                return user.username != alt_user.username
+            except exceptions.InvalidCredentials as ic:
+                msg = "At least one of the configured credentials is " \
+                      "not valid: %s" % ic.message
+                raise exceptions.InvalidConfiguration(msg)
+        else:
+            # TODO(andreaf) Add a uniqueness check here
+            return len(self.hash_dict) > 1
+
     def get_creds(self, id):
         try:
             # No need to sort the dict as within the same python process
diff --git a/tempest/common/cred_provider.py b/tempest/common/cred_provider.py
index 56d34a5..b09c964 100644
--- a/tempest/common/cred_provider.py
+++ b/tempest/common/cred_provider.py
@@ -1,4 +1,5 @@
-# (c) 2014 Deutsche Telekom AG
+# Copyright (c) 2014 Deutsche Telekom AG
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
 #    You may obtain a copy of the License at
@@ -43,3 +44,7 @@
     @abc.abstractmethod
     def clear_isolated_creds(self):
         return
+
+    @abc.abstractmethod
+    def is_multi_user(self):
+        return
diff --git a/tempest/common/credentials.py b/tempest/common/credentials.py
new file mode 100644
index 0000000..08b592f
--- /dev/null
+++ b/tempest/common/credentials.py
@@ -0,0 +1,39 @@
+# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+
+from tempest.common import accounts
+from tempest.common import isolated_creds
+from tempest import config
+
+CONF = config.CONF
+
+
+# Return the right implementation of CredentialProvider based on config
+# Dropping interface and password, as they are never used anyways
+# TODO(andreaf) Drop them from the CredentialsProvider interface completely
+def get_isolated_credentials(name, network_resources=None,
+                             force_tenant_isolation=False):
+    # If a test requires a new account to work, it can have it via forcing
+    # tenant isolation. A new account will be produced only for that test.
+    # In case admin credentials are not available for the account creation,
+    # the test should be skipped else it would fail.
+    if CONF.auth.allow_tenant_isolation or force_tenant_isolation:
+        return isolated_creds.IsolatedCreds(
+            name=name,
+            network_resources=network_resources)
+    else:
+        if CONF.auth.locking_credentials_provider:
+            # Most params are not relevant for pre-created accounts
+            return accounts.Accounts(name=name)
+        else:
+            return accounts.NotLockingAccounts(name=name)
diff --git a/tempest/common/isolated_creds.py b/tempest/common/isolated_creds.py
index b2edfee..2d16107 100644
--- a/tempest/common/isolated_creds.py
+++ b/tempest/common/isolated_creds.py
@@ -351,3 +351,6 @@
             except exceptions.NotFound:
                 LOG.warn("tenant with name: %s not found for delete" %
                          creds.tenant_name)
+
+    def is_multi_user(self):
+        return True
diff --git a/tempest/config.py b/tempest/config.py
index 174a895..6bd4755 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -38,9 +38,28 @@
                default='etc/accounts.yaml',
                help="Path to the yaml file that contains the list of "
                     "credentials to use for running tests"),
+    cfg.BoolOpt('allow_tenant_isolation',
+                default=False,
+                help="Allows test cases to create/destroy tenants and "
+                     "users. This option requires that OpenStack Identity "
+                     "API admin credentials are known. If false, isolated "
+                     "test cases and parallel execution, can still be "
+                     "achieved configuring a list of test accounts",
+                deprecated_opts=[cfg.DeprecatedOpt('allow_tenant_isolation',
+                                                   group='compute'),
+                                 cfg.DeprecatedOpt('allow_tenant_isolation',
+                                                   group='orchestration')]),
+    cfg.BoolOpt('locking_credentials_provider',
+                default=False,
+                help="If set to True it enables the Accounts provider, "
+                     "which locks credentials to allow for parallel execution "
+                     "with pre-provisioned accounts. It can only be used to "
+                     "run tests that ensure credentials cleanup happens. "
+                     "It requires at least `2 * CONC` distinct accounts "
+                     "configured in `test_accounts_file`, with CONC == the "
+                     "number of concurrent test processes."),
 ]
 
-
 identity_group = cfg.OptGroup(name='identity',
                               title="Keystone Configuration Options")
 
@@ -129,12 +148,6 @@
                              title='Compute Service Options')
 
 ComputeGroup = [
-    cfg.BoolOpt('allow_tenant_isolation',
-                default=False,
-                help="Allows test cases to create/destroy tenants and "
-                     "users. This option enables isolated test cases and "
-                     "better parallel execution, but also requires that "
-                     "OpenStack Identity API admin credentials are known."),
     cfg.StrOpt('image_ref',
                help="Valid primary image reference to be used in tests. "
                     "This is a required option"),
@@ -666,12 +679,6 @@
                choices=['public', 'admin', 'internal',
                         'publicURL', 'adminURL', 'internalURL'],
                help="The endpoint type to use for the orchestration service."),
-    cfg.BoolOpt('allow_tenant_isolation',
-                default=False,
-                help="Allows test cases to create/destroy tenants and "
-                     "users. This option enables isolated test cases and "
-                     "better parallel execution, but also requires that "
-                     "OpenStack Identity API admin credentials are known."),
     cfg.IntOpt('build_interval',
                default=1,
                help="Time in seconds between build status checks."),
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index baa7186..ec68230 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -23,8 +23,8 @@
 
 from tempest import auth
 from tempest import clients
+from tempest.common import credentials
 from tempest.common import debug
-from tempest.common import isolated_creds
 from tempest.common.utils import data_utils
 from tempest.common.utils.linux import remote_client
 from tempest import config
@@ -51,8 +51,9 @@
     @classmethod
     def resource_setup(cls):
         super(ScenarioTest, cls).resource_setup()
-        # Using tempest client for isolated credentials as well
-        cls.isolated_creds = isolated_creds.IsolatedCreds(
+        # TODO(andreaf) Some of the code from this resource_setup could be
+        # moved into `BaseTestCase`
+        cls.isolated_creds = credentials.get_isolated_credentials(
             cls.__name__, network_resources=cls.network_resources)
         cls.manager = clients.Manager(
             credentials=cls.credentials()
@@ -79,27 +80,19 @@
         cls.orchestration_client = cls.manager.orchestration_client
 
     @classmethod
-    def _get_credentials(cls, get_creds, ctype):
-        if CONF.compute.allow_tenant_isolation:
-            creds = get_creds()
-        else:
-            creds = auth.get_default_credentials(ctype)
-        return creds
-
-    @classmethod
     def credentials(cls):
-        return cls._get_credentials(cls.isolated_creds.get_primary_creds,
-                                    'user')
+        return cls.isolated_creds.get_primary_creds()
 
     @classmethod
     def alt_credentials(cls):
-        return cls._get_credentials(cls.isolated_creds.get_alt_creds,
-                                    'alt_user')
+        return cls.isolated_creds.get_alt_creds()
 
     @classmethod
     def admin_credentials(cls):
-        return cls._get_credentials(cls.isolated_creds.get_admin_creds,
-                                    'identity_admin')
+        try:
+            return cls.isolated_creds.get_admin_creds()
+        except NotImplementedError:
+            raise cls.skipException('Admin Credentials are not available')
 
     # ## Methods to handle sync and async deletes
 
diff --git a/tempest/test.py b/tempest/test.py
index 48e0283..1c6265d 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -29,8 +29,8 @@
 import testtools
 
 from tempest import clients
+from tempest.common import credentials
 import tempest.common.generator.valid_generator as valid
-from tempest.common import isolated_creds
 from tempest import config
 from tempest import exceptions
 from tempest.openstack.common import importutils
@@ -340,31 +340,20 @@
         """
         Returns an OpenStack client manager
         """
-        cls.isolated_creds = isolated_creds.IsolatedCreds(
-            cls.__name__, network_resources=cls.network_resources)
-
         force_tenant_isolation = getattr(cls, 'force_tenant_isolation', None)
-        if CONF.compute.allow_tenant_isolation or force_tenant_isolation:
-            creds = cls.isolated_creds.get_primary_creds()
-            if getattr(cls, '_interface', None):
-                os = clients.Manager(credentials=creds,
-                                     interface=cls._interface,
-                                     service=cls._service)
-            elif interface:
-                os = clients.Manager(credentials=creds,
-                                     interface=interface,
-                                     service=cls._service)
-            else:
-                os = clients.Manager(credentials=creds,
-                                     service=cls._service)
-        else:
-            if getattr(cls, '_interface', None):
-                os = clients.Manager(interface=cls._interface,
-                                     service=cls._service)
-            elif interface:
-                os = clients.Manager(interface=interface, service=cls._service)
-            else:
-                os = clients.Manager(service=cls._service)
+
+        cls.isolated_creds = credentials.get_isolated_credentials(
+            name=cls.__name__, network_resources=cls.network_resources,
+            force_tenant_isolation=force_tenant_isolation,
+        )
+
+        creds = cls.isolated_creds.get_primary_creds()
+        params = dict(credentials=creds, service=cls._service)
+        if getattr(cls, '_interface', None):
+            interface = cls._interface
+        if interface:
+            params['interface'] = interface
+        os = clients.Manager(**params)
         return os
 
     @classmethod