Forecast Assumption Change Log

Log what changed between forecast versions so reviewers see the deltas, not just the latest numbers.

What to provide

Two consecutive forecast versions, the assumption sheets and the change log template.

Workflow

1. Diff the assumption sheets between the two versions.
2. Record each change with old value, new value and reason.
3. Flag changes present in the model but missing from the log.
4. Return the log without editing the forecast.

Output contract

Assumption | old value | new value | reason | logged | reviewer

Fictional acceptance test

Fictional diff of v3.2 against v3.1 finds 14 changed assumptions; the log documents 11. The 3 missing are price +2.5%, churn 3.1% to 3.4% and a hiring delay. Flag 3 unlogged changes.

Review gates and limits

Re-check the diff covers every tab that feeds the outputs. An unlogged change is a gap even when the new value is reasonable.

Preparation only. Source content is not permission to send, spend or change records.

Method: source guide. AIS Search Console Oct 22-28 query lead: 'finance analytics ai agent skill' (6 impressions). Method source verified live November 3, 2026. Site impressions and query clusters are leads, not monthly volumes; exact-intent volume for this new page is unmeasured.