---
id: changes-with-escaped-quality-issues
slug: /measurement/changes-with-escaped-quality-issues
title: Changes with escaped quality issues
description: Definition, collection evidence and limitations for changes with escaped quality issues.
---

<div className="strategy-content">

**Target operating model — recommended contracts, not installed collection.** All owner and cadence entries below are proposals to confirm before the pilot, not assigned responsibilities or approved schedules.

**Prototype calculation — no live telemetry.** The synthetic example calculates this metric; it has no network collectors.

{/* contract:start */}
Accepted changes with at least one confirmed post-acceptance defect during approved follow-up, split by severity.

| Contract | Definition |
| --- | --- |
| Numerator | Distinct eligible change_ids with one or more linked confirmed defects in follow-up |
| Denominator | Accepted change_ids with completed predeclared follow-up horizon |
| Expression | N / D * 100 |
| Aggregation | percent |
| Unit | % |
| Eligible population | Accepted changes in acceptance window whose follow-up is complete by as_of. |
| Exclusions | Immature changes shown separately; duplicates/unconfirmed reports excluded but counted as pending triage. |
| Events and source | change.accepted; defect.confirmed; defect tracking and acceptance evidence |
| Owner / cadence | Quality Engineering / Monthly mature cohorts |
| Missing evidence | Unknown linkage is a coverage warning; no fabricated clean outcome. Show absolute defect and severe incident counts as well. |
| Gaming and limits | Shorten follow-up or downgrade severity; freeze horizon and rubric and independently sample defects. Descriptive signal, not causal AI productivity attribution. Source completeness, task mix and sampling limit inference; report uncertainty. Counts affected changes, not raw defects per change; no presumption defects are AI-caused. |
{/* contract:end */}

Read the shared [collection and safeguards](./collection-and-safeguards.mdx) before collecting data; see the [synthetic example and limits](./synthetic-example.mdx).

Return to [Skills Measurement](./index.mdx).

</div>