PSD.5:4.1 - Recover the questions and current boundary

Use the plural formulation set from PSD.3 where its differences identify claims or intervention logics that models must discriminate. A formulation is an interpretation of the problem, not already a validated model of the situation. Use the PSD.4 scope and reopen basis for the same subject, receiving decision, operating conditions, and horizon.

These are conditional inputs, not compulsory earlier stages. A qualified direct source may supply the needed formulation or scope. If a needed result is unavailable, stale, outside the present use, or incompatible, return its exact missing premise or narrow the inquiry; do not infer it from the presence of another model.

Turn the live differences into questions, such as “Does this arrangement retain service when road access is lost?” and “Whose loss is omitted by the aggregate service measure?” Keep question, assumed condition, and proposed intervention separate.