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Use Cases and User Stories FPB

However you approach it, requirements are what you are building for.

Traceability FPB

Can you connect your requirements to what you've built? Is there a connection from your user requirements, to the activities carried out in your design - and does that design have a structure that supports those activities and the requirements that the activities of your system fulfill?

The Whole Model FPB

Here is an in-progress model -output as a web site by Visual Paradigm.