How to Validate a Business Idea: 7 Steps With Pass Lines and a Real Example

Step 1: Write the idea as a hypothesis and pick the riskiest assumption

Put the idea into one sentence: who the customer is, which problem hits them and when, how they cope today and what they will pay for your fix. Our worked example^ex: apartment renters in a dense Columbus, Ohio area with no washer in the unit haul laundry to a self-serve laundromat today and will pay a per-order price for drop-off wash-and-fold nearby. The part about your fix is your value proposition.

List the assumptions the sentence makes and rank each on two counts: whether the idea dies if it is wrong, and how much evidence you hold. The fatal, unproven one goes first; steps 3 to 6 test it.

Pass if you can name the one assumption that kills the idea if it is wrong.

Step 2: Pick a first customer you can reach this week

“People who do laundry” is too wide to test; “renters in one Columbus neighborhood with no washer in the unit” is narrow enough. A first customer:

• has the problem now;
• spends money or time on a workaround today;
• can be reached this week, and you can say where.

Among the groups that pass, start with the one that needs the fix soonest.

Pass if you can say where to reach the first customers this week, and they already spend money or time on a workaround.

Step 3: Check demand and market size from your desk

Search for the problem, not only the product name: the words people type when the trouble hits. Google Trends shows relative search interest over time and by region². Google Keyword Planner is free, but to open it you must complete your Google Ads account setup and create a campaign, and accounts without active ad spend see monthly volume as broad ranges such as 1K–10K³.

Count buyers bottom up; a national figure says nothing about one neighborhood. The Census Bureau’s American Community Survey publishes renter-occupied housing unit counts down to the census tract level⁴, and the SBA’s market research guide lists more free sources⁵. When no demand data exists, write “unmeasured” and carry it as a risk instead of filling the gap with an estimate.

Pass if people search for the problem or pay for workarounds today, and you counted the reachable buyers or marked demand “unmeasured.”

Step 4: Find who already solves it, and what they leave out

Rivals prove that people pay for a fix; look for the gap they leave:

1. List the direct rivals: anyone who solves the same problem for the same customer.
2. Note who holds search visibility.
3. Sort the complaints in their reviews by theme. A complaint you can fix is your opening.
4. Look for a rival that already does most of your idea. It is your main risk, and you need a reason to win that it cannot copy.

Pass if you can state, from their reviews, what the leading rivals leave out.

Step 5: Interview strangers about what they did last time

Friends are kind to your idea, so talk to strangers who match the step 2 profile. Find them in local Facebook and Nextdoor groups and city subreddits, on LinkedIn for business buyers, or where the problem happens: for a laundromat idea, the laundromat.

Keep the cold message short: name the problem, say you are not selling, ask for a short call. For example: “Hi, I’m researching how renters in this area handle laundry without a washer at home. Could I ask you a few questions about the last time you did it? I’m not selling anything.” Few replies to a well-aimed message mean the problem is probably not urgent.

Ask:

• when it last happened and what they did about it;
• what it cost them in money or time;
• what they tried before and why they stopped;
• what they would drop for something better.

Leave out “Would you buy this?” and “What would you pay?”: the answers are stated intent. Stop when new calls retell stories you have heard; one published guide puts a first read at around 10 to 15 conversations per buyer segment⁶. End each call with a commitment ask: a deposit, a pilot date or an introduction to someone with the same problem.

Pass if strangers reply, tell a recent case without prompting and agree to a next step.

Step 6: Ask for money before you build

Scale the test to the cost of being wrong, and write the pass line before you start, so the result cannot be argued away.

In the US, pre-orders fall under the FTC’s Mail Order Rule, which also covers internet and phone orders: you need a reasonable basis to ship within the time you state, or within 30 days if you state none, and you must notify buyers of delays and get their consent or refund the payment⁷.

Pass if the test hits the line you wrote before you started.

Step 7: Check the unit math, then decide

Five inputs give the unit economics: price per purchase (P), purchases per customer per month (N), margin as a share of the price (m), customer lifetime in months (L) and the cost to acquire one customer (CAC).

• Monthly contribution per customer = P × N × m
• Lifetime value (LTV) = P × N × m × L
• LTV to CAC = LTV / CAC
• Payback in months = CAC / (P × N × m)

Our decision line: an LTV to CAC of 3 or more holds, 1 to 3 is thin, and under 1 fails. A 3:1 ratio is also a widely cited benchmark for healthy unit economics⁸. Mark every guessed input; a ratio built on guesses passes nothing until you measure the biggest one.

Pass if LTV is at least 3 times CAC on measured inputs (our assumed line) and the payback fits your cash.