So rationale here for requirement documentation is when we are putting in WBS shape, we can evidently make out the requirements if we missed something in scope statement. So requirement documentation is added to emphasize that requirements are closely looked at as this is the last stage where we are working on requirements.
Same things you will get in some other processes as well where Project management plan is input and some subsidiary plan is also there. Idea is just to emphasize that for that process what is required.
The PMBOK also says the same
PMBOK Page 127
Detailed requirements documentation is essential for understanding what needs to be produced as the result of the project and what needs to be done to deliver the project and its final products.
so when we work on detailing Scope in WBS we need to have requirement document along.
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