Bound the first release
Write the completion criteria for the client and internal team. Identify what each role can view and change before choosing page layouts.
Use a small set of representative projects and requests to expose edge cases. Keep billing, complex reporting and unrelated collaboration features outside the first release.
Connect the workflow
Model organisation membership alongside project records and enforce access checks at the data boundary.
Define API responses for valid requests, missing fields and unauthorised access. Review the API contract against the project and membership model before accepting the user journey.
Accept the end-to-end journey
Check the workflow with users from two separate sample organisations, including attempts to access records outside their membership.
Verify interrupted actions and empty states, then record release decisions in the handover board. Prioritise follow-up work from acceptance findings rather than adding speculative features.