{"id":"lead-pricing-test-plan-fields-stop-rule","audience":"product-managers","category":"leadership-work","track":"leadership","level":"intermediate","technique":"constraints","title":"Write a pricing test plan with a metric and a stop rule","free":false,"task":"Write a pricing test plan in plain text with these labeled lines in order: Hypothesis, Metric, Test groups, Duration, Stop rule, Decision owner. Each line is under 22 words. Use only the numbers in the notes and the final duration. Stop rule must be a numeric threshold from the notes. Do not include any revenue forecast or projected result numbers.","materialLabel":"Planning notes (attached to your prompt automatically)","material":"Pricing test for the Starter plan (currently $19/month)\n\n- Idea: raise to $24/month for new signups only.\n- Primary metric: signup-to-paid conversion. Current: 8.5%.\n- Groups: 50% of new signups see $19 (control), 50% see $24 (test). Existing customers unaffected.\n- Duration: first said 2 weeks; the analyst says we need about 4 weeks to reach enough signups (about 1,600 per group).\n- Stop early if the test group's conversion falls below 6.0% after the first 400 signups in that group.\n- Decision owner: Maya Chen (VP Product).\n- Revenue forecast if it works: $180,000 more per year (internal; not for the plan).\n- Competitor charges $22. Don't mention.","rules":[{"type":"maxWords","max":120},{"type":"plainText"}],"mistakes":[{"title":"Old duration","why":"The AI uses 2 weeks.","fix":"Say: \"Duration is 4 weeks.\"","checks":["r1"]},{"title":"Predicting the outcome","why":"The AI says it will increase revenue.","fix":"Say: \"Don't predict the result; leave out the forecast.\"","checks":["r2"]},{"title":"Vague stop rule","why":"The AI says 'stop if it performs badly'.","fix":"Say: \"Use the numeric threshold: below 6.0% after 400 signups.\"","checks":["r2"]},{"title":"Missing labels","why":"The AI writes a narrative.","fix":"Say: \"Six labels in order.\"","checks":["r0"]},{"title":"Markdown","why":"The AI uses a table.","fix":"Say: \"Plain text.\"","checks":["plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each line: \"each under 22 words.\"","checks":["maxWords"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each part instead, for example: \"each line under 12 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Labels","patterns":["hypothesis","metric","test groups","duration","stop rule","decision owner"]},{"label":"Numeric stop","patterns":["6\\.0%","threshold","numeric"]},{"label":"Final duration","patterns":["4 weeks","final"]},{"label":"No predictions","patterns":["don'?t predict","no prediction"]},{"label":"Plain","patterns":["plain text"]}],"hint":"List the six labels, require a numeric stop rule and the final duration, and ban predictions.","rubricLabels":["Has the six labels Hypothesis, Metric, Test groups, Duration, Stop rule and Decision owner on separate lines in that order","Metric is signup-to-paid conversion from 8.5%, Test groups are a 50/50 split at $19 versus $24 for new signups only, and Duration is 4 weeks (not 2)","Stop rule is conversion below 6.0% after the first 400 signups in the test group, Decision owner is Maya Chen, and the revenue forecast and competitor price are absent"]}