A 200-word or less factual summary of most significant information. If document includes a significant bibliography or literature survey, mention it here) This document contains Version 2.0 of the Initial Graphics Exchange Specification, a defined format for the creation of a file which enables data found in today's commercially available CAD/CAM systems to be exchanged or archived. IGES, Version 1.0, published as NBSIR 80-1978 (R) in January 1980, consisted of entity definitions for geometry, drafting and structural information. Definition entities were provied as a means of expanding the utility of IGES. Version 2.0 of the Specification has been extended in the advanced geometry, electrical, and finite element modeling areas. In addition, the Specification has been reformatted and clarified to enable the user to reference the document more easily. 12.