Dear Ahmed, Kadar is just talking about the Registration for Engineer, this is not applicable for supporting staff like Planner, QS, Procurement. Its only applicable for those Engineers who will deal with the authority and responsible for installation. Such as for Municipal Related to CIVIL Structural engineer, KAHRAMAA related to Electrical Engineers & QCD related to Mechanical Engineer. Thats all i know as i am from MEP background. And for Planning Engineers its not required to my knowledge.