You've shipped the MVBP. Customers paid. You can see the logos on the website.
And now you stop and ask the question every founder secretly avoids: are they actually using it?
Because paying for a product and using a product are not the same thing. The first is a moment. The second is a habit. The first lives in your revenue spreadsheet. The second lives in your retention curve. Only one of them tells you whether you have a business.
The two-part test
"The dogs will eat the dog food" is one of the few Aulet metaphors that survives the journey from agriculture metaphor to startup framework. There are two halves to it, and both must be true.
The dogs eating: are the end users actually using the product? Engagement, frequency, depth.
The owners buying: are the economic buyers re-upping, expanding, recommending? Renewal, expansion, advocacy.
One without the other doesn't work. End users who love it but whose company won't pay are a charity. Buyers who keep paying for software their team has abandoned are a one-quarter delight followed by churn the moment procurement looks at the usage report.
Both halves. Both measured. Both honestly.
The metrics that aren't optional
Four metrics, minimum. None can substitute for the others.
Activation rate
The percentage of customers who actually do the core action the product is designed for, within a meaningful window. For B2B SaaS, that's usually within the first thirty days. For consumer, often the first session. If your activation is below 50%, the product isn't doing what the brochure said it would.
Engagement frequency
How often the user comes back. Weekly active over monthly active is a useful ratio for many products. If the ratio is below 0.4, the product isn't sticky enough to build a business on.
Retention curve
The percentage of customers still using the product at week one, week four, week twelve, month six. The shape of the curve matters more than the numbers. A flat curve after the initial drop means you have a product. A curve that keeps falling means you have a leak.
Net Promoter Score
The proxy for word of mouth. Imperfect, gameable, but the best single number for advocacy. Above 50 means customers are evangelising. Between 0 and 50 means they're satisfied. Below 0 means they're sabotaging you in conversations you'll never hear.
Four numbers. Track them weekly. Plot them on a wall. Argue about them at every team meeting.
The qualitative cross-check
Numbers lie when you stop questioning them. Pair every metric with three customer calls every week.
Not surveys. Calls. Twenty minutes each. Open-ended. The questions are unchanging.
- "What were you doing before our product?"
- "What do you do with it now?"
- "What would change if it vanished tomorrow?"
- "Who else have you told about it?"
The last question is the only honest version of "would you recommend us?" If they've told no one, the NPS score lied to you. If they've told three colleagues without being asked, you have something.
Three calls a week. Twelve a month. Founders who do this find product-market fit faster than founders who don't, by a wide margin.
What the timing of adoption tells you
One Aulet point worth absorbing: sometimes the dogs aren't eating because of timing, not product.
Electronic medical records were a terrible product in 2002, a hard sell in 2008, and an inevitability by 2018. The product barely changed. The market did.
If your adoption is slow and the qualitative feedback is "the product is great, but…" — listen carefully to the "but". If the "but" is about budgets, that's price or model. If the "but" is about timing — regulation, market readiness, workflow change — you might have shipped a year too early, and the right move is to extend runway, not iterate the product.
That said: founders use "we're too early" as a cope for "the product isn't good enough" about ten times more often than the actual condition occurs. Be honest with yourself about which one you're in.
The word of mouth measurement
The single most valuable signal at this stage is word of mouth, because it's the one input that compounds.
Word of mouth lowers CAC. Word of mouth shortens sales cycles. Word of mouth pre-qualifies customers so they convert faster and churn less. Word of mouth is the reason early advocates are worth more than ten quiet customers.
Measure it. Ask explicitly: "have you mentioned us to anyone in your network in the last thirty days?" Track the percentage who say yes. That percentage should rise as the product matures. If it's flat or falling, your retention curve is hiding a problem you'll discover later as churn.
NPS is the proxy. Asking the direct question is the truth.
The intellectual honesty
The most important sentence Aulet writes about this step is the simplest: rely on real-world data, not abstract logic.
Your model says the product should be useful. Your logic says they should adopt. Your spreadsheet says retention should hold at 92%.
None of that is data. The data is whether they opened the app yesterday. The data is whether the second-week retention is 67% or 41%. The data is whether the contract that comes up for renewal next quarter renews without negotiation, with negotiation, or with churn.
Founders who can sit with data that contradicts their model are the founders who fix products before they kill businesses. Founders who can't, don't.
This is the stage where the discipline of the framework either pays off or doesn't. Trust the data. Then act on what it tells you, not on what you wish it told you.