This study documents the development of the Automated Process And Sequence Selector (APASS) model and associated computer software. APASS can be effectively used to automate the selection of machine tools for rotational parts during the process planning procedure for these parts. The APASS model bases its machine tool decisions on part feature description, such as surface shape, technical information! and part header information. Data on the surface shape are transformed automatically based on conversion tables to output suggested machining processes and machine tools. These processes are further filtered by technical information contained within the master and machine files. The ultimate APASS output is a sequence of machining operations based on both the geometrical and dimensional tolerances of the part surfaces and the machine availability. The program has been written in MS PASCAL and currently run on IBM PC/AT compatible.