Abstract. This paper reviews the most relevant literature dealing with the development of computer environments for the conceptual design of mechanical systems and assemblies. Selected literature is reviewed and discussed in relation to meeting the following requirements of such an environment: (l) representing and supporting top-down design, (2) representing and supporting multiple functional viewpoints, (3) representing functional knowledge, (4) representing spatial relationships and geometry, (5) maintaining consistency, and (6) providing analysis and other support. An appendix listing related readings is included.