sentences:  This was done by considering the idea of quantum protectorate in the context of quantum theory of magnetism.It was suggested that the difficulties in the formulation of quantum theory of magnetism at the microscopic level, that are related to the choice of relevant models, can be understood better in the light of the QP concept.It was argued that the difficulties in the formulation of adequate microscopic models of electron and magnetic properties of materials are intimately related to dual, "itinerant" and "localized" behaviour of electrons.