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Don't dismiss non-functional requirements
Requirements gathering includes not just the functional requirements, but the non-functional ones: Budgets, deadlines, technology, operating environment, security, etc. We shouldn't dismiss these as "false" but I do agree that we should not confuse them with the functional requirmements. I recommend separating requirements into three major categories - functional, constraints, and security/compliance. Requirements gathering and validation/signoff for each involves different stakeholders.