The STEP Application modules define common building blocks to create modular Application Protocols (AP) within ISO 10303. Higher-level modules are built up from lower-level modules. The modules on the lowest level are wrappers of concepts, defined in the Integrated Resources (IR) or Application Integrated Constructs (AIC). Modules on a medium level link lower level modules with each other and specialize them. Only modules on the highest levels completely cover a particular area so that they can be implemented.
Implementation modules and modules defining conformance classes:
Foundation modules:
References
ISO 10303 Application Modules Wikipedia(Text) CC BY-SA