E.11.PUR:5.1.1 - An earlier result still answers the concern

The same team already has a C.28 causal-use result for the same pump model, intervention question, declared use, sources, assumptions, and qualification window. The team uses C.28 to compare that result episteme and edition with the present concern. Every comparison value still matches, so the team cites the result and stops instead of performing the C.28 use again.

If the team uses the result as a premise in a project discussion and the source-to-use account is still implicit, it uses A.10 to make the source → result → claim connection explicit for that bounded use. If the later gate Work relies on that result, its A.10 evidence-provenance path names the result and bounded use. If new operating conditions change the causal-use assumptions or qualification window, the team reopens that affected C.28 question rather than treating the old result as current or restarting every coordinated pattern use.