This workshop is part of our effort to prepare a Guide to ISO/IEC/IEEE 42020 Architecture Processes. The ArchWG has been heavily involved in the development of the ISO/IEC/IEEE 420X0 series of standards of which consist of ISO/IEC/IEEE 42010 Architecture Description. ISO/IEC/IEEE 42020 Architecture processes, and ISO/IEC/IEEE 42030 Architecture description. The Guide to ISO/IEC/IEEE 42020 is a planned ArchWG product that will integrate the series of standards with guidance to produce and end-to-end architecting effort. The workshop will gather use case scenarios and requirements for the Guide. ArchWG also plans a session prior to IW'21 for those not already familiar with the specifications of the three standards in the 420X0 series.