Why it matters in B2B GTM
Marc Andreessen's original framing still holds: you don't have product-market fit if you have to ask whether you have product-market fit. When it lands, the signals are unambiguous — usage spikes, retention holds, sales cycles compress, and word of mouth does work your marketing team can't.
The most-cited proxy metric is Sean Ellis's question: "How would you feel if you could no longer use this product?" If 40%+ of active users say "very disappointed," you're likely there. Below 25%, you almost certainly aren't.
Product-market fit is segment-specific, not product-specific. You can have fit with one ICP and not another. The right move after early fit is usually to double down on the segment that's working, not to chase the next segment until the first is repeatable.
How ICPGTM uses it
ICPGTM Playbooks helps founders find fit faster by stress-testing three ranked ICPs before they commit — so the wedge you double down on is the one most likely to produce "very disappointed" responses, not just polite enthusiasm.
Related terms
- Ideal Customer Profile(ICP)
An Ideal Customer Profile (ICP) is a written description of the type of company that gets the most value from your product and is easiest for you to sell to, broken down into firmographics, jobs-to-be-done, pains, and buying triggers.
- Wedge Strategy
A wedge strategy is the deliberate choice to enter a market by serving one narrow, underserved segment exceptionally well — using that beachhead to earn trust, generate referrals, and expand into adjacent segments.
- Value Proposition
A value proposition is the specific, measurable benefit a customer gets from your product — the answer to "what do I get, how much, and how is it better than what I'm doing today?"
- Positioning
Positioning is the deliberate choice of the market category you compete in, the customers you're best for, and the unique value you deliver — the answer to "who is this for, what is it, and why should they care?"
- Product-Led Growth(PLG)
Product-Led Growth (PLG) is a go-to-market motion where the product itself drives acquisition, activation, and expansion — usually through a free tier, free trial, or self-serve checkout — instead of relying primarily on a sales team to open accounts.
Apply this to your own product
Generate three ranked ICPs, a buyer committee, outreach drafts, and a 30/60/90 GTM plan in about 90 seconds — your first playbook is free.