The theory of Federalism that has been popularized by eminent scholars like K.C Wheare (the doyen of federalism), Spinelli, Elazar, Elaigwu and Riker. Other relevant theories to be taught include the functionalist theory, the Neo-functionalist theory, the theory of inter- governmentalism, the Liberalist theory, the internationalist theory. The concept of regionalism, the conflict approach, the organizational approach, and the five-driver approach.