"Advise on the right chart. The data: monthly signups for 3 plans over 24 months, one plan relaunched in month 13 The single message the chart must carry: the relaunch worked and did not cannibalize the other plans Audience and medium: executives, one slide, 10 seconds of attention Deliver: 1. The recommended chart type, and the reason stated as perception, not preference (what the eye compares easily: position along a scale beats angle, aligned bars beat stacked, and so on). 2. The runner-up and the specific case where it would win instead. 3. Design spec for the winner: axis choices (zero-based or not, and why), sort order, what gets color and what stays gray, the one annotation that does the pointing, and the title written as the message itself, not the data description. 4. The lie check: how this chart could accidentally mislead (truncated axis, cherry-picked window, unequal bins) and the guardrail for each. 5. What to drop: the elements a default charting tool will add that this message does not need. If the data cannot support the message, say so; do not design a chart for a claim the data does not make."
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