REC Change Proposal R0121 is introducing new secure data exchange use cases (Process Types) in August 2024. We are updating the Secure Data Exchange Portal (SDEP) User Guide (a Category 3 document) to align with the new Process Types and using the opportunity to review it more generally. In particular, we want to create a comprehensive overview describing the intended / best practice use of all SDEP Process Types, to help ensure that queries are raised correctly and therefore can be resolved more easily.