A network management system (NMS) including a policy manager (PM) associated with a set of policies and including distribution means for sending said policies to policy enforcement points (PEP.sub.1, PEP.sub.2, PEP.sub.3, PEP.sub.4) in accordance with distribution instructions via policy decision points (PDP.sub.1, PDP.sub.2), characterized in that said policy manager further includes validation means for validating if said policy enforcement points can enforce said policies and correcting said distribution instructions as a function of said validation.