select-from-frontier

select-from-frontier

Purpose

Select a preferred point or portfolio from a Pareto frontier and state the sacrificed alternatives and tradeoffs.

Input contract

required: [pareto_frontier, preference_policy, objective_schema, decision_context]
optional: [tie_breaker, stakeholder_weights, robustness_report]
constraints: [preference direction and acceptable sacrifice bounds are explicit]

Procedure

1. Confirm that each selectable point is feasible and that frontier membership is current.
2. Apply the declared preference policy or tie-breaker to frontier points, preserving objective values.
3. Record the selected point, nearest alternatives, sacrificed objectives, and sensitivity to preference changes.
4. Emit the selection rationale and a re-open trigger if the preference or evidence changes.

Output contract

produces: [selected_frontier_point, tradeoff_record, rejected_alternatives, reopen_trigger]
delta_fields: [findings, evidence_updates, uncertainties, decisions, recommended_jumps]

Quality gates

• Selection includes the chosen point, its frontier position, at least one rejected alternative, and the sacrificed objective.
• A tie is resolved only by a declared tie-breaker; otherwise return co-preferred points.

Failure and counterexamples

Do not select an interior point as if it were a frontier compromise. If preferences are missing, return the frontier and request a policy.

Provenance map

• resolved: selection-from-frontier