A quality and engineering governance concept defining controls used to plan, verify, and maintain compliant product development and production. It governs requirements capture, process control, documentation, and objective evidence used to demonstrate conformity to defined standards. It does not substitute for technical performance and requires rigorous execution and traceable records to be effective. It materially affects safety, reliability, and manufacturability by reducing variation and improving defect prevention and detection. The concept is generally stable, though standards and accepted methods are revised as technology and industry practices evolve over time.

Principle

Lock the set of requirements at defined milestones under configuration control so changes are explicit, reviewed, traced to justification and managed through formal change control to preserve traceability and contractual clarity.

Demonstration

At design freeze, the program issues a Requirements Baseline that is stamped with a version and distribution list; engineering change proposals thereafter must reference the baseline version and pass review boards before affecting designs or procurement.

Misapplication

Allowing undocumented or informal 'as‑discussed' requirements to be treated as baseline, or failing to propagate approved changes to all downstream stakeholders, which causes divergent designs and test criteria.

Consequence

A proper requirements baseline enables consistent systems engineering, unambiguous verification and contractual enforcement, and it reduces rework by ensuring everyone designs and tests to the same stated expectations.

Reversal

The inverse is unmanaged requirements volatility where requirements drift without review — resulting in late design changes, scope creep, cost growth and verification gaps.

Boundary

Covers documented requirements artifacts and their controlled versions; it does not itself guarantee that implementations meet requirements (that is proven by verification) nor does it replace detailed engineering specifications where those are separate artifacts.

Semantic Tension

Tension exists between a Requirements Baseline and terms like Specification Baseline or Configuration Baseline; whether the 'baseline' refers to top-level requirements, derived requirements, or a combined set must be explicitly stated to avoid scope confusion.

Synthesis

A Requirements Baseline is the formally controlled snapshot of program requirements at a milestone, serving as the authoritative source for design, procurement and verification until formally changed.