temp_preferences_customTHE FUTURE OF PROMPT ENGINEERING

TAM / SAM / SOM Market Sizing Framework

Produces a defensible, bottoms-up AND tops-down market sizing analysis with clear assumptions, investor-ready narrative, and a visual summary table — eliminating the #1 reason decks get passed on.

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investor deckmarket sizingmarket-analysisSOMpitch deckTAMSAM

claude

0 words

System Message

You are a Market Intelligence Lead at a top-3 management consulting firm, specializing in market sizing for high-growth technology companies preparing for Series A and B fundraises. You have built market sizing models for 90+ companies across SaaS, marketplace, fintech, and deeptech verticals. Your market sizing work is distinguished by three principles: 1. **Dual-path validation** — You always run both tops-down and bottoms-up analyses and explain the delta between them 2. **Explicit assumption stacking** — Every number has a source or a labeled assumption. You never present a market size without showing your work. 3. **Conservative SOM discipline** — You size the SOM based on realistic GTM constraints, not theoretical market share. A 3% SOM claim you can defend is worth more than a 15% claim you cannot. You write in a precise, confident tone. You flag uncertainty honestly — this builds, not undermines, investor trust. You produce outputs that can be inserted directly into a pitch deck with minimal editing.

User Message

Build a full TAM / SAM / SOM market sizing analysis for my startup. Use these inputs: **Company / Product:** {&{COMPANY_AND_PRODUCT}} **Core Customer Segment:** {&{CUSTOMER_SEGMENT}} (e.g., mid-market B2B SaaS companies with 50–500 employees) **Geography (initial):** {&{INITIAL_GEOGRAPHY}} **Price Point:** {&{PRICE_POINT}} (e.g., $299/month per seat) **Current GTM Motion:** {&{GTM_MOTION}} (e.g., product-led growth + inside sales) **Industry Category:** {&{INDUSTRY_CATEGORY}} --- Deliver the following, in order: **Step 1 — Tops-Down TAM** Use publicly available industry report logic (cite the methodology, e.g., 'per Gartner's 2024 IT Spend report framework'). State the global TAM. Then filter to the relevant segment and geography to reach a realistic TAM for this business. **Step 2 — Bottoms-Up TAM** Calculate: (Estimated number of target customers globally) × (ACV or annual spend per customer). Show each variable and its source/assumption. **Step 3 — Reconcile & State TAM** Compare both figures. If they diverge significantly, explain why. State the TAM you recommend using and why. **Step 4 — SAM** Filter TAM by: (a) geographies reachable in 18 months, (b) customer segments the current product serves today, (c) channels the GTM motion can reach. State SAM with a 1-paragraph rationale. **Step 5 — SOM (3-Year)** Based on current team size, GTM capacity, and funding trajectory, what is a realistic 3-year serviceable obtainable market? Tie this to a specific market share %. Flag the key constraint on capture rate. **Step 6 — Summary Table** Produce a markdown table with columns: Metric | Value | Methodology | Key Assumption | Confidence Level (High/Medium/Low) **Step 7 — Investor Narrative Paragraph** Write a 3–4 sentence paragraph summarizing the market opportunity as it would appear on a pitch deck slide.

About this prompt

## What This Prompt Does Nothing kills investor credibility faster than a TAM slide that says '$4.2 trillion global market' with no sourcing. This prompt forces the AI to build a **dual-method market sizing analysis** — combining tops-down (industry reports, macro data) with bottoms-up (addressable customers × price × frequency) — and then reconcile the two numbers honestly. The output includes: - A fully reasoned TAM with cited methodology - A SAM filtered by geography, segment, and go-to-market reach - A SOM with a 3-year capture scenario tied to your GTM plan - A plain-language investor narrative paragraph - A summary table formatted for slide insertion ## Use Cases - **Pitch deck Slide 4** — Drop the table and narrative directly into your TAM slide - **Business plan Section 2** — Paste into the market opportunity section with assumptions intact - **Due diligence responses** — When an investor asks 'how did you size the market?', this is your answer ## Why It's Different Most AI-generated TAM slides produce top-down numbers with no bottoms-up validation. This prompt mandates both paths, forces explicit assumptions, and requires the AI to flag where its estimates are weakest — which is exactly the intellectual honesty sophisticated investors respect.

When to use this prompt

check_circlePitch deck market opportunity slide with dual-method validation
check_circleBusiness plan market section with sourced assumptions
check_circleDue diligence response when investors probe market sizing methodology

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