{
  "capability_id": "engineering.process.cpm",
  "tool_id": "cpm",
  "engine": "cpm",
  "calculation_version": "1.0.0",
  "generated_at": "2026-09-16T22:38:08.849Z",
  "engine_build": "2026-09-16",
  "test_count": 7,
  "passed": 7,
  "failed": 0,
  "tests_summary": {
    "golden": {
      "total": 0,
      "passed": 0
    },
    "boundary": {
      "total": 4,
      "passed": 4
    },
    "property": {
      "total": 3,
      "passed": 3
    }
  },
  "engine_tested": true,
  "expert_reviewed": false,
  "internally_reviewed": false,
  "review_kind": null,
  "source_checked": true,
  "reviewed_by": null,
  "reviewer_role": null,
  "last_reviewed": null,
  "expert_review": {
    "status": "optional_not_performed",
    "reviewer": null,
    "scope": [
      "formula",
      "input semantics",
      "assumptions",
      "limitations",
      "sources",
      "tests"
    ],
    "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance."
  },
  "internal_review": {
    "status": "not_applicable",
    "reviewer": null
  },
  "page": "https://www.calculatorx.com/calc/engineering/process-capability-cpm",
  "api": "https://www.calculatorx.com/api/v1/calc/cpm",
  "schema_input": "https://www.calculatorx.com/schemas/engineering.process.cpm.input.json",
  "schema_output": "https://www.calculatorx.com/schemas/engineering.process.cpm.output.json",
  "assumptions": [
    "Taguchi Cpm = (USL−LSL)/(6√(σ²+(μ−target)²)) from stated μ, σ, LSL, USL, and target.",
    "Not Cp/Cpk (those ignore the target in the denominator), not Pp/Ppk, and not a 1.33 verdict."
  ],
  "limitations": [
    "Design-stage from stated μ and σ — not measured in-control SPC",
    "Not Cp/Cpk (those ignore the target in the denominator)",
    "Not Pp/Ppk (those use sample s and have no target)",
    "This page does not issue a Cpm≥1.33 verdict"
  ],
  "boundary_conditions": [
    "missing target → MISSING_REQUIRED_INPUT",
    "sigma ≤ 0 → VALUE_MUST_BE_POSITIVE",
    "USL ≤ LSL → INVALID_INPUT"
  ],
  "sources": [
    {
      "title": "Chan, Cheng, and Spiring — A new measure of process capability: Cpm",
      "section": "Cpm = (USL−LSL)/(6√(σ²+(μ−T)²))",
      "supports": "Cpm penalizes deviation from a target; it is not Cp and not Cpk",
      "kind": "reference"
    },
    {
      "title": "ISO 22514-2 — Statistical methods in process management — Capability and performance",
      "section": "Capability vs performance; target-based indices",
      "supports": "This page is a design-stage target index, not overall sample Pp/Ppk",
      "kind": "standard"
    }
  ],
  "methods": [],
  "fingerprint": "sha256:02bc64d347a46103128f974c0ab6493b764096cab1a67fbce7be2e75e17b7d94",
  "tests": [
    {
      "id": "boundary-cpm",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "lsl": 0,
        "usl": 12,
        "mu": 6,
        "sigma": 1,
        "target": 6
      },
      "expect": {
        "Cpm": 2,
        "offset": 0
      },
      "expectWarning": null,
      "actual": {
        "Cpm": 2,
        "mu": 6,
        "sigma": 1,
        "target": 6,
        "offset": 0,
        "lsl": 0,
        "usl": 12
      },
      "tol": 1e-12
    },
    {
      "id": "boundary-cpm-shift",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "lsl": 0,
        "usl": 12,
        "mu": 7,
        "sigma": 1,
        "target": 6
      },
      "expect": {
        "Cpm": 1.414213562373095
      },
      "expectWarning": null,
      "actual": {
        "Cpm": 1.414213562373095,
        "mu": 7,
        "sigma": 1,
        "target": 6,
        "offset": 1,
        "lsl": 0,
        "usl": 12
      },
      "tol": 1e-12
    },
    {
      "id": "boundary-cpm-missing",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "lsl": 0,
        "usl": 12,
        "mu": 6,
        "sigma": 1
      },
      "expectError": "MISSING_REQUIRED_INPUT",
      "code": "MISSING_REQUIRED_INPUT",
      "error": "target is required"
    },
    {
      "id": "boundary-cpm-sigma",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "lsl": 0,
        "usl": 12,
        "mu": 6,
        "sigma": 0,
        "target": 6
      },
      "expectError": "VALUE_MUST_BE_POSITIVE",
      "code": "VALUE_MUST_BE_POSITIVE",
      "error": "sigma must be greater than zero"
    },
    {
      "id": "property-cpm",
      "ok": true,
      "kind": "property",
      "detail": "2",
      "expect": 2,
      "actual": 2
    },
    {
      "id": "property-cpm-shift",
      "ok": true,
      "kind": "property",
      "detail": "√2",
      "expect": 1.414213562373095,
      "actual": 1.414213562373095
    },
    {
      "id": "property-cpm-alias",
      "ok": true,
      "kind": "property",
      "detail": "2",
      "expect": 2,
      "actual": 2
    }
  ],
  "tier": "engine_tested",
  "verification": {
    "tests": {
      "passed": 7,
      "total": 7,
      "golden": 0,
      "boundary": 4,
      "property": 3
    },
    "contract_checks": {
      "passed": 4,
      "total": 4
    }
  },
  "evidence_core_generated_at": "2026-09-16T21:07:40.795Z",
  "rendered_at": "2026-09-16T22:38:08.849Z",
  "release_integrity": {
    "status": "verified",
    "scope": "workspace",
    "production_attestation_required": true,
    "calculation_version": "1.0.0",
    "artifacts": {
      "engine": "1.0.0",
      "page": "1.0.0",
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      "input_schema": "1.0.0",
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      "mcp_contract": "1.0.0"
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    "digests": {
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      "capability_sha256": "753de243ea26a9bb41ae1f8339e4213606bafb2e63b372a2c40f1074acfb5268",
      "engine_sha256": "c8d4ccdbfeaf61d7b024d4e1babb0c2ba3b324c1b37bd0cb456a526d8d2b1bd1",
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    },
    "contract_checks": {
      "total": 4,
      "passed": 4,
      "failed": 0,
      "items": [
        {
          "id": "release-artifacts-aligned",
          "status": "pass",
          "detail": "1.0.0"
        },
        {
          "id": "schema-valid-input-executes",
          "status": "pass"
        },
        {
          "id": "engine-success-output-validates-schema",
          "status": "pass"
        },
        {
          "id": "schema-rejects-incomplete-input",
          "status": "pass"
        }
      ]
    },
    "report": "https://www.calculatorx.com/.well-known/calculatorx-release-integrity.json"
  }
}