Modeling is an essential step in the design of digital circuits [71. The coding of behavioral models for complex devices is a labor intensive task. Even with the use of a to01like the "Modeler's Assistant" [4}, the development of behavioral models is time consuming and labor intensive. The use of re-usable code along with a tool like the Modeler's Assistant can speed up model development. This thesis defines a set of higher level primitives which can be used for this purpose. These primitives are built as a macro library into the tool. The Modeler's Assistant together with the modeling primitives provides us with a tool that can simplify the process of model development. / Master of Science