SYSE.28:1 - Problem frame

Use this pattern when a justified constraint already exists but engineers must decide where and how a supported path will check or enforce it. Start with the constrained subject, applicable conditions, deciding authority and the reliance that would be prohibited if the constraint were not met.

The first result is a control-placement design: an applicable check or mechanism, the subject it observes, its point of use, the meaning of its outcomes and the response to failure or uncertainty. It is not a new policy or a release decision.

A software artifact can change after an early verification; a physical dimension can change after coating; an access decision can expire before a resource is used. Place the control where it can answer the actual question. If the constraint, its justification or the authority is missing, return that question instead of inventing a platform rule.