Definition
A Requirement is a clearly defined need, expectation or condition that a product, service, process or system must satisfy.
Human Explanation
It states what a solution must achieve, not how it will be implemented.
Why it Matters
Clear Requirements provide a basis for design, Validation, testing and conformity assessment.
Conceptual Boundary
A Requirement is not a solution or technical design.
Practical Perspective
It should be unambiguous, verifiable and traceable throughout the Project lifecycle.