cpm-engine

An open-source CPM engine with AACE-aligned methodology and a published Daubert disclosure. Open source. AACE-aligned. Daubert-disclosed. JS/Python parity across 1,128 unit tests + 747 cross-validation checks on the enumerated CPM comparison surface (see DAUBERT.md §3.1).

Court-facing usage: pair this engine with the analyst-application discipline in FORENSIC_USE_SOP.md, the verification chain in VERIFY_RELEASE.md, the per-release receipts in release-evidence/, and the field-level P6 comparison framework in validation/p6-comparison/. Do NOT cite README in a court-facing report — cite the documents listed in DAUBERT.md and FORENSIC_USE_SOP.md §Required pairing.

Maintained by Critical Path Partners — a forensic-scheduling consultancy.

Quick start

npm install @critical-path-partners/cpm-engine

const E = require('@critical-path-partners/cpm-engine');

const result = E.computeCPM(
    [
        { code: 'A', duration_days: 5, early_start: '2026-01-05', clndr_id: 'MF' },
        { code: 'B', duration_days: 3, clndr_id: 'MF' },
        { code: 'C', duration_days: 4, clndr_id: 'MF' },
    ],
    [
        { from_code: 'A', to_code: 'B', type: 'FS', lag_days: 0 },
        { from_code: 'B', to_code: 'C', type: 'FS', lag_days: 0 },
    ],
    {
        dataDate: '2026-01-05',
        calMap: { MF: { work_days: [1, 2, 3, 4, 5], holidays: [] } },
    }
);

console.log('Project finish:', result.projectFinish);     // 2026-01-21
console.log('Critical path:', result.criticalCodesArray); // ['A', 'B', 'C']
console.log('Engine version:', result.manifest.engine_version); // 2.9.37

That's it. Forward pass, backward pass, total float, free float, calendar arithmetic, P6-conventional date math, multi-jurisdiction holidays — all done.

Why this engine?

*(Vendor comparison removed in the v2.9.33 audit cycle. Comparisons against specific commercial CPM tools should be supplied by an independent reviewer, n

... View full README on GitHub