PSD.10:4.1 - Start from a comparison that could change

Name the subject, configuration, horizon, receiving question, considered alternatives, and result currently being claimed. Ask which premise could change their consequences, relative standing, eligibility, or the need for a probe. If the alternatives themselves are unclear, return that candidate question.

Use PSD.5’s model account only where its evidence or assumptions bear on this same configuration and horizon. The model can expose an uncertainty without resolving it. A current qualified direct result can supply the same premise without requiring a model-building exercise.

Check both relative and absolute consequences. An uncertainty shared by all alternatives can leave their order unchanged yet show that none meets a required service or safety condition. Do not dismiss it as irrelevant merely because it is not a ranking discriminator.