Appendix B — Design glossary

Acceptance criterion. Predetermined rule defining whether observed results satisfy a requirement.

Constraint. Boundary condition that restricts allowable designs.

Concept. Candidate solution approach before full implementation.

Design validation. Evidence that the final solution serves the intended users and use context.

Design verification. Evidence that specified requirements were met.

Iteration. Repetition of design activities in response to new information.

Prototype. Representation built to answer design questions, not necessarily to resemble the final system.

Traceability. Documented links among needs, requirements, decisions, and evidence.