HiPerWin process model is presented by using IDEF0 function modeling method in detail. In IDEF0 method the functions describing the conceptual model are illustrated with a graphical representation of a set of components that are presented with hierarchical parent – child diagrams. HiPerWin IDEF0 model is composed of a series of diagrams that hierarchically indicate increasing levels of functions and their interfaces in detail. Inputs, outputs, controls and mechanisms of each function are expressed.