This diagram shows concepts, or the application objects, for STEP and STEP-NC and the relationships between them, as well as a link to the definitions. These are definitions that make sense to an engineering professional — high-level concepts like workpieces, workplans, and product shape.
The browser text search function is the fastest way to find a concept. Avoid Internet Explorer or Safari, they display the diagrams but do not have full SVG support for following links. All other browsers work fine. Updated 2020-10-29 with FDIS ballot