{"id":"fpa-model-change-log-entry","audience":"fpa","category":"finance-work","track":"finance","technique":"format","level":"beginner","title":"Write a model change log entry with the impact math","free":false,"task":"You documented a change to the revenue model today. Write a prompt for a plain-text change log entry with exactly these labels, one per line: \"Date:\", \"Changed by:\", \"Location:\", \"Change:\", \"Impact on FY27 revenue:\", \"Reviewer:\". The impact line shows the math. Include only the change that affects numbers. Under 80 words.","materialLabel":"Analyst's working notes (attached to your prompt automatically)","material":"Working notes - Revenue Model v14, Nov 5, 2026 (Ilan)\n\nThings I did today:\n1. Changed the new-customer growth rate on the Drivers tab, cell C7, from 18% to 15% after the sales review. This rate applies to the FY26 revenue base of $5,000,000 to get FY27 growth revenue.\n2. Fixed the header formatting on the Summary tab (font size and a column width). No formulas touched.\n3. Renamed the file from rev_model_v13 to rev_model_v14.\n\nI have not asked anyone to review the change yet. The sales director (Gil) might be the right reviewer, I'll check with him tomorrow.\n\nFYI the CFO prefers that the log lists amounts as negative numbers with a minus sign and a dollar sign, e.g. -$20,000.","rules":[{"type":"plainText"},{"type":"maxWords","max":80}],"promptHints":[{"label":"Names the six labels","patterns":["date:","changed by","location:","reviewer"]},{"label":"Limits to numeric changes","patterns":["only the change","affects numbers","skip"]},{"label":"Asks for impact math","patterns":["math","impact"]},{"label":"Handles reviewer","patterns":["pending","don'?t name"]},{"label":"Caps length","patterns":["\\d+\\s*words","plain"]}],"mistakes":[{"title":"Logging every change","why":"The AI lists the formatting fix and file rename as changes.","fix":"Say: \"Log only the change that affects numbers.\"","checks":["r0"]},{"title":"Impact with no math","why":"The AI writes 'revenue decreases' without the figure.","fix":"Add: \"Show the math: base x (new rate - old rate).\"","checks":["r1"]},{"title":"Naming an unassigned reviewer","why":"The AI puts Gil as reviewer.","fix":"Add: 'Reviewer: write \"Pending\" if nobody is assigned.'","checks":["r2"]},{"title":"Markdown extras","why":"The AI adds bold labels, headings and a closing note.","fix":"Say: \"Plain text, no bold. Output only the lines asked for.\"","checks":["plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting and runs past word limits.","fix":"Ask for fewer words than the real cap and keep each line short.","checks":["maxWords"]}],"hint":"A change log records what moved the numbers, who reviews it, and how big the effect is. Say which change to log and what to put when no reviewer is assigned.","rubricLabels":["Location is the Drivers tab, cell C7, and Change shows 18% to 15%; the formatting fix and file rename are not logged","Impact line shows $5,000,000 x (15% - 18%) = -$150,000","Date is Nov 5, 2026, Changed by is Ilan, and Reviewer says pending (or not yet assigned) and does not name Gil as the reviewer"]}