Computer-aided process planning (CAPP) is the vital link between design and manufacturing. An expert process-planning system called EPPSU has been developed to automate process planning and fixturing activities. The process planning system employs forward planning: i.e. it begins with the blank part and applies operations for each face/feature until it reaches the finished part model. After each operation the machined region is removed and a new intermediate model is generated. A part model description scheme called PONG has been utilized to represent blank, finished and intermediate models within the database. This paper explains finished part modelling within the process-planning system.