Version management for manufacturing system software involves a two-part data structure, having two identifiers that are separately and automatically modified, depending upon the changes or modifications that are made, respectively, to top-level and lower-level subsets of manufacturing system programs. According to various other aspects of the present invention, methods for managing revisions involve automatically assigning a version designator under preselected conditions, automatically notifying personnel having a need to know of the change, and managing revisions by way of a revision compare function.