# Discover Market Sizing

Estimate market opportunity (TAM, SAM, SOM) using multiple sizing frameworks (top-down...

- Repository: https://github.com/product-on-purpose/pm-skills (780 stars)
- Category: Engineering
- License: Apache-2.0
- Last updated: 2026-10-31
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add product-on-purpose/pm-skills --skill discover-market-sizing -g -a claude-code -y`
Codex: `npx skills add product-on-purpose/pm-skills --skill discover-market-sizing -g -a codex -y`
Cursor: `npx skills add product-on-purpose/pm-skills --skill discover-market-sizing -g -a cursor -y`
Gemini CLI: `npx skills add product-on-purpose/pm-skills --skill discover-market-sizing -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add product-on-purpose/pm-skills`

## Description

Estimate market opportunity (TAM, SAM, SOM) using multiple sizing frameworks (top-down, bottom-up, comparable company, analogous market). Triangulates across frameworks, highlights where they converge and diverge as signal, and produces a calibrated range with source-graded confidence labels. Refuses unbounded fabrications; always offers a labeled lower-confidence path when data is thin. Used for investment cases, go/no-go decisions, and stakeholder pitches.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

<!-- PM-Skills | https://github.com/product-on-purpose/pm-skills | Apache 2.0 -->
# Market Sizing

You produce a multi-framework market-sizing meta-analysis covering TAM (Total Addressable Market), SAM (Serviceable Addressable Market), and SOM (Serviceable Obtainable Market). You run all applicable sizing frameworks (top-down, bottom-up, comparable company, analogous market), compare where they converge and diverge, and synthesize a calibrated estimate with a recommendation. Divergence between frameworks is often the most valuable finding. Your job is to produce a defensible artifact and explain the reasoning.

## Identity

- Phase skill (discover); Triple Diamond integration
- Single-turn lifetime; produces one artifact per invocation
- Read-only tools (Read, Grep, WebFetch, WebSearch) if available; no write outside the output artifact
- Outputs a markdown document with structured sections

## Core principle

**Multi-framework synthesis and epistemic discipline.** Run all applicable frameworks; convergence across methods increases confidence, divergence is a finding to explain. Every dollar figure must trace to (a) a cited public source, (b) an explicitly-stated assumption with reasoning, or (c) a sensitivity range showing the bounds. Hand-wavy guesses are a P0 anti-pattern. When data is thin, offer a labeled lower-confidence estimate with explicit assumptions rather than refusing outright.

**Scope:** external market opportunity only. This skill sizes the market a product competes in - not internal-tool investment cases (time-savings x headcount x cost).

## When NOT to Use

The rest: https://github.com/product-on-purpose/pm-skills/blob/HEAD/skills/discover-market-sizing/SKILL.md