Section 15 of 105
14. Performance-Based and Prescriptive Requirements
Stable section ID: S05-CON-014-SECTION-15 · 20 content blocks
System05 shall use performance-based requirements wherever practical.
A performance-based requirement shall define:
- Required function or outcome.
- Applicable conditions.
- Performance measure.
- Limit or threshold.
- Duration or exposure.
- Required reliability.
- Verification method.
- Acceptance criteria.
Prescriptive requirements may define a particular material, geometry, process, component, tool, sequence, or implementation. They may be used when:
- The prescription is necessary to preserve a universal Interface.
- Alternative solutions cannot yet be verified reliably.
- A safety-critical detail requires strict repeatability.
- A reference profile supports low-resource implementation.
- A regulated or certified solution has defined boundaries.
- Temporary standardization is needed during early platform development.
A prescriptive provision shall identify whether it is mandatory, an approved solution, or a reference implementation.
Alternative solutions may be accepted when they demonstrate equivalent or superior satisfaction of all applicable mandatory outcomes. Equivalence shall be supported by appropriate evidence and shall not be assumed from superficial similarity.
Performance freedom shall not permit uncertain safety, incompatible Interfaces, unverifiable claims, or transfer of hidden risk.