FPF Reference

    OPTION-COMPARISON - Compare alternatives and select the current result kind

    Preface node heading:option-comparison-compare-alternatives-and-select-the-current-result-kind:493

    What this page is

    This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

    Methodology

    Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

    Content

    • Situation and question. Several possibilities are present, but the current need may be to define comparison, retain diversity, govern a live pool, publish a selected set, or make one local choice. Ask which of those relations is current.
    • Template A. A.19.ECS Solution -> EvaluationCharacteristicSpaceSpec. Select when coordinates, scales, evidence rules, and protected trade-offs are not adequate for comparison.
    • Template B. C.18 Solution -> ExplorationArchiveRecord@Context | FrontRecord@Context. Select the archive result when later use relies on retained variants and their lineage or diversity; select the front result when later use relies on inspectable non-dominance and its comparator basis.
    • Template C. C.19 Solution -> PoolPolicyResult. Select when a still-live pool needs one explicit widen, keep frontier, narrow to subset, or sunset line treatment and a change trigger.
    • Template D. G.5 Solution -> Shortlist | RankedShortlist | SpecialistHandoff | abstain or escalation outcome. Select when selector-facing publication of a set or narrowed handoff is current; use a ranked result only when order materially belongs to the published result.
    • Template E. C.11 Solution -> ChoiceResult. Select when an OptionSet and comparison basis exist and one local choose, reject, probe, or reroute result is current.
    • Boundaries. Stop at the result answering the current option question. Return when candidate membership, archive policy, dominance basis, pool policy, selector publication, comparison basis, preference order, or probe value changes. An archive is not a live pool, narrowing a pool does not publish a shortlist, and a shortlist is not a local choice.
    • Public coarsening. "Option comparison" is the recognizable situation; the expansion restores evaluation specification, archive, front, pool-policy result, selected-set publication, or local choice under its exact condition.

    Last Updated: 2026-07-12 — upstream FPF commit 44dd8818 (github.com/ailev/FPF)