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Library / First Principles Framework (FPF) - Core Conceptual Specification
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E.23:4.4 - Method-family selection

Method familyUse when
PDSAorPDCAFamilyLearning quality, baseline comparison, measuring instruments, or standardize-then-repeat action matter for the improvement loop.
POOGIFamilyThe evaluation problem is throughput-shaped or constraint-shaped.
OODAFamilyOrientation quality and feedback under changing conditions affect the evaluation.
RalphLikeGeneralAdaptiveFamilyA broadly capable agent can improve the object through repeated specification, feedback, memory, and verification under C.19.1 cost and risk discipline.
FixedPerformerObjectVersionUnderImprovementOptimizationFamilyThe performer or harness stays fixed while the object version is edited and re-evaluated.
NQDQualitySideImprovementFamilyThe evaluation supplies the Q side for a declared NQD and OEE comparison and loop changes seek a non-dominated change in evaluated Q coordinates.
SoTAReachAndMaintainFamilyReaching or maintaining an externally assigned front depends on composing several accepted source or practice anchors.
SpecializedObjectFamilyCycleA specialized method family fits a declared characteristic space and is BLP-compatible.

The selected family is justified by characteristic-space fit, the declared scale-qualified predicted evaluation-result changes, cost and risk, and protected trade-offs. Familiarity, automation, or current popularity is not enough.