SYSE.19:0 - Use This When

Use this pattern when an engineering decision relied on a claim in a model, requirement, standard, MethodDescription, supplier specification, research result, or another engineering source, and a later edition or replacement may change that claim. The project needs to know which decisions remain usable and which need new Work.

Begin with the predecessor and later source epistemes. Compare the claims that can change engineering action, then recover decisions and Work results whose stated reasoning depends on those claims. Revalidate only the affected use; a new file or edition label is only a cue to inspect.

The first useful result is a bounded source-change impact decision: the engineering use supported by the current basis, with the limitation or blocker that matters to its receiver. A compatible carrier change can finish with a repaired reference. For a material claim change, preserve, narrow, reopen or withdraw only the affected use. New revalidation Work is selected when the receiving question warrants it. Identify any later performed Work, returned evidence and replacement engineering decision separately.

Use SYSE.14 when the engineered System or its release is changing, and SYSE.13 when configuration identity and effectivity are the main question. Use SYSE.7 to maintain several descriptions used by one decision and SYSE.10 to qualify new model, experiment, or trial evidence. Use FPF E.15 when an FPF pattern edition itself changes.