How Waterfall Deals with Software Requirements
Waterfall projects define all software requirements upfront. The project cannot proceed unless these requirements have been identified and documented.
Some Waterfall projects may have a dedicated team to capture, collect, and gather these requirements. They may use questionnaires, face-to-face or phone interviews, white boards, and modeling tools to capture stakeholder and customer requirements.
Once the initial requirements are defined, the team should produce a requirements specification document (sometimes they may create more than one). This document defines what needs to be delivered so everyone understands the scope of the project.