diff --git a/xos/synchronizer/model_policies/model_policy_att_workflow_driver_service.py b/xos/synchronizer/model_policies/model_policy_att_workflow_driver_service.py
new file mode 100644
index 0000000..5fb076c
--- /dev/null
+++ b/xos/synchronizer/model_policies/model_policy_att_workflow_driver_service.py
@@ -0,0 +1,46 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# 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 synchronizers.new_base.modelaccessor import AttWorkflowDriverServiceInstance, model_accessor
+from synchronizers.new_base.policy import Policy
+
+class AttWorkflowDriverServicePolicy(Policy):
+    model_name = "AttWorkflowDriverService"
+
+    def handle_update(self, service):
+        self.logger.debug("MODEL_POLICY: handle_update for AttWorkflowDriverService", oss=service)
+
+        sis = AttWorkflowDriverServiceInstance.objects.all()
+
+        # TODO(smbaker): This is redudant with AttWorkflowDriverWhiteListEntry model policy, though etaining this does provide
+        # a handy way to trigger a full reexamination of the whitelist.
+
+        whitelist = [x.serial_number for x in service.whitelist_entries.all()]
+
+        for si in sis:
+            if si.serial_number in whitelist and not si.valid == "valid":
+                self.logger.debug("MODEL_POLICY: activating AttWorkflowDriverServiceInstance because of change in the whitelist", si=si)
+                si.valid = "valid"
+                si.save(update_fields=["valid", "no_sync", "updated"], always_update_timestamp=True)
+            if si.serial_number not in whitelist and not si.valid == "invalid":
+                self.logger.debug(
+                    "MODEL_POLICY: disabling AttWorkflowDriverServiceInstance because of change in the whitelist", si=si)
+                si.valid = "invalid"
+                si.save(update_fields=["valid", "no_sync", "updated"], always_update_timestamp=True)
+
+
+    def handle_delete(self, si):
+        pass