Test your business idea: know there is a market before you invest

Test your business idea before you put money into it, and your plan rests on evidence rather than applause. Friends and family like the idea, and they mean it, but none of them had to do or pay anything. The question that decides your business stays open: will enough customers buy, at a price you can live on? You can answer most of it before you sign a lease or hand in your notice.

Why testing a business idea pays off

Starting is easy; staying open is harder. Of US private-sector establishments opened in the year to March 2015, 34.7% were still operating ten years later (source: US Bureau of Labor Statistics, December 2025). In the UK, the five-year survival rate for businesses born in 2019 is 38.4% (source: Office for National Statistics, November 2025).

Closing is not always failure; some owners stop before debts pile up. Testing moves that decision to the cheapest moment, before the lease, the fit-out and the stock, by asking in advance: are there enough customers, and does their price cover your costs?

Three layers of testing

Testing runs from coarse to fine, and each layer gives stronger evidence than the one before.

Layer one: the market and your industry

Start with the industry: how many businesses there are, what they turn over, which channels they sell through and what is changing. The industry figures show turnover, cost structure and typical margins per sector, and the profit and cost benchmark puts your rough budget next to existing businesses. If you count on a margin far above your industry, you should be able to explain why. Then visit competitors and note their prices and what they leave undone.

Layer two: customer conversations with a purpose

Next, talk to people who could become your customers. Steve Blank's customer development method starts here: a start-up searches for a repeatable and scalable business model, and that search happens with customers, outside the office. How you ask matters more than how often. Rob Fitzpatrick's The Mom Test rests on a simple observation: people are polite about your idea, so ask about their lives instead.

• Ask about the past, not the future: "When did this last go wrong, and what did you do?" says more than "Would you buy this?"
• Ask what it costs now: in money, time or hassle. A problem nobody spends anything on is rarely worth solving.
• Listen more than you talk: once you pitch, you collect compliments instead of facts.

Layer three: let the customer do something

Conversations show what people say; only when they act or pay do you see what they want.

• Pre-sale: you sell a product, voucher or subscription before it exists. One payment says more than ten enthusiastic talks.
• Landing page: your offer, price and an order button on a simple web page; you measure who clicks.
• Paid pilot: the most honest test for a service, at a real rate.

Eric Ries defined the minimum viable product (MVP) as the version of a new product that yields the most validated learning about customers for the least effort. It is a tool for learning rather than a stripped-down release, and a pre-sale can be enough.

Treat your assumptions as hypotheses

Blank describes a business model as a set of hypotheses: assumptions that may turn out to be wrong. Research supports testing them that way. In a randomised trial with 116 Italian start-ups, founders taught to formulate and test hypotheses like scientists performed better and were more likely to pivot to a different idea (source: Camuffo et al., February 2020). That is the point: a weak idea costs least when you drop it early.

1. 01

   Write your assumptions down

   One testable sentence each: not "people want good coffee" but "commuters buy a coffee on at least three mornings a week". Start with the one that sinks the plan if it is wrong.

2. 02

   Set the threshold in advance

   Write down which result counts as a fail, then pick the cheapest test in which the customer acts or pays. A bar set afterwards lands wherever you happen to land.

3. 03

   Decide: go, pivot or stop

   Ries calls this choice pivot or persevere. A pivot is a structural change of course, and the new direction is a hypothesis you test in turn.

Worked example: a coffee bar tests before signing the lease

Maya, a barista trainer, wants to open a 40-seat coffee bar in a former bookshop next to a commuter station. The rent is €3,100 a month on a five-year lease, and the landlord wants an answer within six weeks. She tests four assumptions, each with a threshold written down beforehand. The logic works in any currency.

Fictitious Firmfocus example. Figures are illustrative and not industry averages.

The mornings are strong, but a 40-seat bar at €3,100 a month needs afternoon trade that is not there. Maya pivots to the smaller unit next door, a takeaway counter with ten seats at €1,700 a month, and will test an afternoon offer later. Her tests cost €1,130 (cart hire €450, coffee and cups €600, printing €80). The lease she nearly signed committed her to €186,000 over five years.

How far should you test? Freelancer or premises, stock and staff

Data protection when you do market research

An anonymous survey is the simple case: under the EU General Data Protection Regulation (GDPR), data protection principles do not apply to information that cannot be linked to an identifiable person. A waiting list or pre-sale is different, because names and email addresses are personal data. You then need a legal ground, such as consent or legitimate interests, and must tell people who you are, why you collect the data, the legal basis and how long you keep it. If an agency runs the research, its duties must be set out in a contract. Elsewhere the principle is similar, but the rules differ.

• Check your country: read the small-business guidance of the data protection authority where you and your respondents are based.
• Collect less: if an email address is enough, ask for nothing else.
• Say it up front: a short notice on the form with who you are, why you ask and how long you keep the data.

Privacy rules change, so check the official guidance before you launch a sign-up page.

Testing traps to avoid

• Only asking people you know: friends are the kindest and least reliable panel.
• Moving the bar: a threshold set after the test is not a test.
• Testing the easy assumption: start with the one that sinks the plan, often price or volume.
• Free samples as proof: people take what is free; test at full price.
• Testing forever: research feels safer than selling, yet only sales confirm demand.

When are you done testing?

You are ready for the business plan when you can tick these points.

• Riskiest assumptions tested: with customer behaviour, beyond opinions.
• Evidence for the price: some customers paid or accepted a quote at your rate.
• Known first customers: you know who they are, by name or as a clear group, and how to reach them.
• Figures in line with the industry: your margin and costs are close to comparable businesses, or you can explain why not.
• A stop rule: you know which result after launch makes you adjust or stop.

Your plan then records what you know and what you still assume, and your test results feed the sales forecast. The next step is to write your business plan. All steps are in start in eight steps, and every other topic in Start a business.