market-sizinglisted

Size a market top-down and bottom-up as TAM, SAM, and SOM, reconcile the two within a stated tolerance, and register every input as an assumption with a source or a test. Use when a business case, a where-to-play choice, a board question, or a Gate 1 cost-of-inaction calculation needs a market number that survives the question "where did that come from". Takes a segment definition, a unit, a price with its source, and count sources; returns both sizings, the reconciliation, a sensitivity range, and the assumption rows.
RizwanZafaris/product-manager-OS · ★ 0 · AI & Automation · score 72

Install: claude install-skill RizwanZafaris/product-manager-OS

# Market Sizing: two methods that must agree, and every input on the record A market size fails when it is one number from an analyst headline, a small share of a large figure, and a spreadsheet nobody can reopen. The business case then rests on it, the board quotes it, and the first real customer count proves it wrong. This skill runs the sizing twice, from the top and from the bottom, forces the two to reconcile, and files every input where a reviewer can attack it. ## Files this skill drives - [../../frameworks/strategy/market-sizing.md](../../frameworks/strategy/market-sizing.md), the worksheet and its reconciliation table - [../../templates/definition/assumptions-register.md](../../templates/definition/assumptions-register.md), one row per input that is not a sourced fact - [../../templates/planning/business-case.md](../../templates/planning/business-case.md), where SOM lands in the benefits as a range with its assumption IDs beside it - [../../templates/discovery/evidence-note.md](../../templates/discovery/evidence-note.md), one per external figure, with the URL and the definition the source used - [../../templates/planning/product-strategy.md](../../templates/planning/product-strategy.md), where SAM per segment informs where to play - [../../templates/planning/gtm-plan.md](../../templates/planning/gtm-plan.md), whose first cohort must be a countable subset of SOM - Method background: [../../knowledge/crossing-the-chasm.md](../../knowledge/crossing-the-chasm.md) (Moo