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Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.23:4.3 - Maturity ladder (poset, not a scalar; Description, not Spec)

Publish one editioned MaturityCardDescription for the exact evaluated MethodFamily, G.5 registry edition, evidence profile, claim scope and selected slices, qualification window, and intended admission use (UTS enum ids; scale kind = ordinal; reference plane declared). Do not embed acceptance thresholds here; an admission floor remains a G.4 AcceptanceClause cited by R1.

  • L0 — Anecdotal. Claims exist; lanes sparse; examples ad‑hoc.
  • L1 — Worked‑Examples. Multiple worked examples with lane tags and Scope slices declared; no replication yet.
  • L2 — Replicated. Independent replications identify their distinct bearers or operating conditions and declare the claim scope and selected slices, source and method editions, and qualification windows used; lane separation is observed and decay windows are explicit.
  • L3 — Benchmark‑Severe. Repeated wins or parity on community baselines or severe tests; cross‑Tradition bridges declared with loss notes.

Optional rung (for QD/OEE‑heavy families; ordinal, closed enum):

  • L4 — QD‑Hardened. Archive stability under declared InsertionPolicy/DistanceDef editions; reproducible IlluminationSummary improvements under controlled budgets; OEE generators pass EnvironmentValidityRegion severe tests.

Norms. M1. The ladder is lane‑aware (TA/VA/LA) and freshness‑aware; it is not a global numeric score. Declare Scale kind=ordinal and the closed enumeration of rungs; register the enum at UTS (twin labels; editioned). M2. Transitions MUST be justified by EvidenceGraph paths (once G.6 is available) and published at UTS; missing anchors ⇒ no advance. M3. Any maturity floor used for admission—for example, a run-critical selector use requiring at least L2—MUST be authored as a CAL.AcceptanceClause and cited by R1 with its policy edition, claim scope, qualification window, and verdict; SoS-LOG does not embed acceptance thresholds. M4. Declare the MaturityCard reference plane. If an admission decision relies on a relation to another plane, cite that exact obtaining plane relation, its direction and loss, and the applicable policy edition; a supported loss penalty selected under R4 affects R_eff only.

Rationale note. Treating maturity as a poset aligns with B.3’s requirement for lawful comparisons and avoids scalarisation across ordinal/ratio scales; assurance penalties selected under R4 affect R_eff, never F/G.