摘要：Role based access control is one of the widely used access control *** are investigations in the literature that use knowledge representation mechanisms such as formal concept analysis(FcA),description logics,and Ontology for representing access control ***,while using FcA,investigations reported in the literature so far work on the logic that transforms the three dimensional access control matrix into dyadic formal *** transformation is mainly to derive the formal concepts,lattice structure and implications to represent role hierarchy and constraints of *** this work,we propose a methodology that models RBAc using triadic FcA without transforming the triadic access control matrix into dyadic formal *** discussion is on two lines of *** present how triadic FcA can provide a suitable representation of RBAc policy and we demonstrate how this representation follows role hierarchy and constraints of RBAc on sample healthcare network available in the literature.