Abstract This article introduces a Disagreement Index (DI) to measure formal disagreement in Westminster cabinet decision‐making using declassified archival records. The DI converts observable decision outcomes, including approval, amendment, deferral, and rejection, into a standardized quantitative measure. The index is demonstrated using a complete set of documents from a British Columbia cabinet meeting to illustrate feasibility. The article shows how cabinet minutes can be systematically coded to produce transparent and replicable indicators of formal disagreement and to support longitudinal and comparative analysis where consistent documentary records are available.
Kennedy Stewart (2026) studied this question.