PSD.12:4.4 - Map holding regions and reversals

Report which condition holds in each relevant region, where alternatives exchange order, where a threshold is crossed, and where the comparison becomes unsupported. Include boundaries and ties when they can change the return.

Separate a genuine reversal from a different question. A new value rule, candidate, subject, or horizon may define another comparison rather than a parameter change inside the old one. Preserve the original basis so that the reader can see which happened.

Test omissions as well as numbers. A stable two-candidate result can be irrelevant if a material third candidate remains unexamined. A common failure can show that all current alternatives are inadequate. Return that candidate or formulation gap instead of calling the least bad option acceptable.

The result may be a robust retained set, a conditional preference, several non-dominated alternatives, a failure region, an unresolved boundary, or a blocker. No single preferred alternative is required.