Use Change Logs and Versioned Assumptions to Keep Models Explainable
Explain how assumption versioning and change logs improve trust and reviewability.
A model without memory makes every output change harder to defend. Why versioning is a control When outputs shift, leaders need to know whether the business changed, the assumptions changed, or the workbook changed. Versioned assumptions and a short change log make that distinction visible. What to record You do not need a project-management system inside Excel. You need enough history to explain the movement: date, owner, assumption block, old value, new value, and reason. That is usually sufficient for review and debug. How it improves sensitivity work Sensitivity outputs are more credible when the base case is stable and…
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