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The paper describes the status of work aimed at extendingthe international standard ISO 10303 (STEP) to permitthe exchange of procedurally defined shape models betweenCAD systems. Such models are specified by the sequenceof operations used to construct them rather than by the explicitelements they contain. They have the advantage of beingeasy to edit in a receiving system, by contrast with theexplicit models that can be exchanged using current standards,which prove to be inert after transfer. The use of theproposed methodology in the exchange of realistic proceduralshape models of mechanical parts has already beendemonstrated, and a brief account is given of some of thetests that have been performed.