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Status Report of the Second Quarter, FY92 (January 1 through March 1992)



Howard Bloom


An emerging information standard will make products more affordable to develop, manufacture, and maintain. The standard is STEP (STandard for the Exchange of Product model data). U.S. development efforts are collectively called PDES (Product Data Exchange using STEP). Much of STEP is being tested at NIST, in the National PDES Testbed.

The International Organization for Standardization (ISO) voted to issue a STEP Initial Release at year's end. NIST members were selected to lead STEP's Initial Release Qualification Team and compile the EXPRESS information-modeling portions. ISO adopted Testbed recommendations for planning and managing STEP Application Protocol (AP) development. A system for classifying APs was prototyped. An Application Protocol Qualification Manual draft was completed and used to qualify the first drafting AP. Findings were released on harmonizing STEP's tolerancing model with existing tolerancing standards. The draft specification for the STEP Data Access Interface was enhanced. The STEP Bulletin Board System was replaced by a file server that allows users to locate information more quickly. The Data Probe editor entered alpha testing. Two object-oriented database tools were evaluated. Technical reports were published on conformance testing, tolerancing, the AP Framework, and STEP Implementation Tools.

NIST Interagency/Internal Report (NISTIR) - 4914
Report Number


STEP, PDES, product data model, status report, ISO, application protocol development, AP


Bloom, H. (1992), Status Report of the Second Quarter, FY92 (January 1 through March 1992), NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 24, 2024)
Created May 1, 1992, Updated October 16, 2008