Intent. Present the stability lane as a supplemental, non-GAAP risk disclosure beside classical KPIs. Classical measurements remain unchanged; lanes add bounded, interpretable context.
Policy.
- Collapse parity (non-negotiable). Classical results are preserved:
phi((m,a)) = m. - Display policy (plain labels). Publish bands from
avia declared thresholds; communicate in simple language (A++/A+/A0/A-/A--). - Suggested disclosure text (paste-ready).
“Stability lane (a) is a bounded, non-GAAP indicator published beside classical KPIs. Classical measurements remain unchanged; the lane quantifies current steadiness and timing-drift risk.” - Governance (minimal, reproducible). Keep a manifest (ASCII), run conformance checks, and optionally add tamper-evident stamps.
- Privacy posture. No PII in lane fields or stamps; stability is about the number, not the person.
Why this framing works.
- Comparable and bounded.
a in (-1,+1)supports consistent banding across KPIs without scale tricks. - Order-invariant composition. Lane fusion is deterministic across batch/stream/shuffled:
a_out := tanh( (SUM w*atanh(a)) / max(SUM w, eps_w) ) - Read-only by design. Lanes guide attention; controls and ledgers stay untouched unless a formal safety case is approved.
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