diff --git a/osm_lcm/temporal/vnf_activities.py b/osm_lcm/temporal/vnf_activities.py
index d47318f..3ea8c64 100644
--- a/osm_lcm/temporal/vnf_activities.py
+++ b/osm_lcm/temporal/vnf_activities.py
@@ -21,6 +21,7 @@
     GetVimCloud,
     GetVnfDescriptor,
     GetVnfRecord,
+    GetModelNames,
     ChangeVnfState,
     ChangeVnfInstantiationState,
     SetVnfModel,
@@ -171,3 +172,20 @@
 class SendNotificationForVnfImpl(SendNotificationForVnf):
     async def __call__(self, activity_input: SendNotificationForVnf.Input) -> None:
         self.logger.debug("Send notification for VNF not implemented.")
+
+
+@activity.defn(name=GetModelNames.__name__)
+class GetModelNamesImpl(GetModelNames):
+    async def __call__(
+        self, activity_input: GetModelNames.Input
+    ) -> GetModelNames.Output:
+        ns_id = activity_input.ns_uuid
+
+        vnfrs = self.db.get_list("vnfrs", {"nsr-id-ref": ns_id})
+        self.logger.debug(
+            f"Retrieved {len(vnfrs)} vnf records matching {ns_id} from database."
+        )
+
+        return GetModelNames.Output(
+            model_names={vnfr["namespace"] for vnfr in vnfrs if "namespace" in vnfr}
+        )