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What Is a Requirement and Why Is It Misunderstood? Types, Qualities of a Good Requirement and Separating Problem from Solution

A requirement is not a screen but a statement of a need together with its constraints and conditions. Using Bookstore's bulk ordering feature for schools and libraries, we cover business, stakeholder, functional, non-functional, constraint and transition levels, the qualities of a good requirement in ISO/IEC/IEEE 29148, hunting vague words, and finding the problem behind a solution sentence like "an Excel upload screen".