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Validating STEP Application Models at the National PDES Testbed

This document is part of the National PDES Testbed Report Series and is intended to complement the other reports of the Validation Testing System (VTS) project. Specifically, other documents are available which fully describe the model validation methodology used in the Testbed, software requirements for the VTS, and details of the software which automates that methodology. These documents are referred to throughout this report. The problem of sharing data has many facets. The need for the capability to share data across multiple enterprises, different hardware platforms, different data storage paradigms and systems, and a variety of network architectures is growing. The emerging Standard for the Exchange of Product Model Data (STEP), a project of the International Organization for Standardization (ISO), addresses this need by providing information models which clearly and unambiguously describe data. These models are organized into application protocols. An application protocol addresses the data sharing needs for a particular application area. STEP integrates the information requirements from all the application protocols. The validity of these information models is essential for success in sharing data in a highly automated environment. This document describes how application models will be validated in the National PDES Testbed at the National Institute of Standards and Technology. (PDES, Product Data Exchange using STEP, is the U.S. effort in support of the international standard.) Application model development and testing is a complex process which involves synthesizing, analyzing, and manipulating large amounts of diverse information. Most of the process relies exclusively on human capabilities for analysis, judgment, and interaction; however, part of this process can and should be automated. A strategy for automation is based on an analysis of the information flow needed for the development and testing process and initial experiences with automation for validation testing at the National PDES Testbed.