The manufacturing processes required to make an engineered part must be selected with consideration to cost, producibility and quality. Process planning, which is selection of the most appropriate production processes, is both an art and a science. Several process-planning software systems for mainframe computers are currently available. In this paper, process planning with the aid of a microcomputer is discussed. The computer program developed is used in an interactive mode and written in MBASIC. In this software development, the geometrical programming technique is used for the selection of optimal machining parameters.