PMF Levels

A four-level framework from Todd Jackson (First Round Capital) for diagnosing where a B2B product sits on the product-market fit spectrum — and what to do next. The framework operationalises “do we have PMF?” into a continuous diagnostic rather than a binary gate.

The four levels

The level is a product state, not a company state. A company can have L3 PMF with one customer segment and L1 PMF with another it is trying to enter.

Three dimensions

PMF level is assessed across three dimensions simultaneously:

1. Satisfaction — Do customers love the product? Would they be “very disappointed” if it went away (the Sean Ellis benchmark, which Todd endorses as a useful proxy at ≥40%)?
2. Demand — Is there market pull? Are customers coming to you without heavy push sales motion?
3. Efficiency — Can you acquire customers cost-effectively? Is the go-to-market repeatable?

A product can score well on satisfaction (customers love it) but poorly on efficiency (it takes six months of hand-holding to close each deal). That is still L2, not L3 — all three dimensions must be strong for a level upgrade.

The $100 vending machine test

A discovery technique for uncovering genuine willingness to pay and demand depth: imagine a vending machine in your office that dispenses your product for $100 per use — no relationship, no sales process, no SLA. Would your target customers pay? How often?

The test forces away from “is this useful?” (almost everything is useful at $0) toward “is this essential at a cost?” It also surfaces who the real buyer is: the person willing to pay $100 from their own budget, not just the person willing to use a free trial.

The four Ps pivot model

When a company is stuck at L1 or L2, Todd identifies four pivot levers, in rough order of cost:

The model argues that most founders reach for Product too quickly. Persona and Problem pivots are cheaper and faster — and often reveal that the original product was right but aimed at the wrong buyer or framed around the wrong job.

The marginal customer trap

At L3/L4, the temptation is to push into adjacent segments to grow faster. Todd’s caution: adding a segment that has weaker PMF pulls your metrics toward the mean. Aggregate NPS or retention numbers that were L3 with your core segment become L2 when you blend in a segment you haven’t cracked. This is not progress — it is dilution of a real signal.

The discipline is to be explicit about which segment you are measuring against which level, and to keep the core-segment metric clean as you expand.

Dollar-driven discovery

The standard mistake in customer discovery: asking about opinions and preferences (“would you use this?”, “how important is this?”). People over-state both. Todd’s corrective: anchor every discovery conversation to real economic behaviour.

• What did you pay for the last solution to this problem?
• What would you pay for a solution that worked perfectly?
• Who controls that budget?

“Don’t get friend-zoned” — a phrase from Ironclad founder Stuart Landesberg via Todd: a customer who calls you every week for advice, enthusiastically attends demos, and gives referrals but never signs a contract is not a customer. Enthusiasm is not demand; economic commitment is demand.

Company examples by level

See also

• Todd Jackson on Product-Market Fit Levels, Customer Discovery, and the Four Ps
• Todd Jackson
• Product Market Fit Engine
• Jobs to Be Done