This skill should be used when the user asks to "calculate TAM", "determine SAM", "estimate SOM", "size the market", "calculate market opportunity", "what's the total addressable market", or requests market sizing analysis for a startup or business opportunity.
SkillScore70Maintained
Automatic
◆Product Management pack
Last verified 8/29/2026
What it changes
Passed 16 of 23 test cases with the skill, and 15 of 23 without it.
Without skill65%
With skill70%
Checks it passed that the model alone missed
Recommends using the value theory methodology for sizing market opportunity in non-existent or novel product categories.
Explains that value theory derives market size from quantified economic value delivered to customers and willingness to pay.
1 fixed15 passed either way7 still failing0 broke
Pass-rate lift
+4 pp
Tokens
+17%
Agent turns
0%
Response time
-6%
Model gemini-3.6-flashMeasured 8/29/2026v116 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
A test case the skill fixed. Same model, same prompt, with and without the skill.
Prompt
We are developing a novel quantum encryption software for which no existing market reports or direct competitors exist. Traditional market research yields zero data. How can we estimate our market opportunity when historical category sales data does not exist?
What was checked, without and with the skill
Checked
Without skill
With skill
Recommends using the value theory methodology for sizing market opportunity in non-existent or novel product categories.
Missed
Passed
Explains that value theory derives market size from quantified economic value delivered to customers and willingness to pay.
Missed
Passed
case-08 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md48 lines2 files
Market Sizing Analysis
Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.
Use this skill when
Working on market sizing analysis tasks or workflows
Needing guidance, best practices, or checklists for market sizing analysis
Do not use this skill when
The task is unrelated to market sizing analysis
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
Overview
Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).