This is a detailed how-to guide to ensuring your requirements are fully captured. It is a useful guidebook with processes you will tweak and adapt to each project plan. Is anything surprising or new to you? You will not use all of these approaches for every project, but having them at hand is useful when planning your next project.
Requirements Development
Business Case/ITIR
The Business Case, Project Charter, Information Technology Investment Request (ITIR) or other documentation created during project initiation clearly outlines the project deliverable expectations and justification. This document will generally provide high-level business requirements that you will use to guide the development of functional and non-functional requirements. It may even include some of the functional and non-functional requirements themselves. This is the starting point for user requirement discovery, providing a context for discussions and communications.