What to do before you write a business plan
By the 4W1N team ·
Most advice about business plans starts with how to write one. The more useful question comes earlier: is your idea ready to be written down? A plan built on guesses doesn't become more true because it's well formatted, and the cheapest time to find out you're wrong is before you've spent weeks on it.
Understand the problem before the solution. Know exactly who has it, and talk to them. Look at the market around them, and check the money works. Then test the one assumption that would sink the idea if it were wrong. After that, write the plan, even if some answers are still "I don't know yet".
Should you validate your business idea before writing a business plan?
Yes, in almost every case. A business plan turns your assumptions into confident-looking sentences. If those assumptions are untested, you end up with a polished document that hides the weakest parts of your idea, including from you. Lenders and investors read a lot of plans. They can usually tell a founder who has tested their idea from one who has only described it.
Validating doesn't mean building the product or proving everything. It means getting enough real evidence that you're choosing a direction on purpose, not by hope. The six steps below give you a practical order for working through the biggest unknowns before you commit to the plan.
The one exception: if you need a plan right now, for example because a lender or a grant application requires one, write it. Just mark clearly which parts are assumptions you haven't tested yet, and test them as soon as you can.
Before you start: know who the plan is for
A plan for a bank looks different from one for an investor, and different again from one you write purely to think clearly. Decide the reader first, because it changes what you need to find out.
Step 1Understand the problem before the solution
Most founders start with the solution, whether that's a product, an app or a service, and work backwards to a problem. A plan written that way describes an answer looking for a question. Start the other way round.
Write the problem down in one or two sentences, in the plain words your customer would use, not industry terms. Then work out:
- How often does it happen?
- What does it cost them in time, money or stress?
- What do they do about it today, and what have they already tried?
A problem people already spend money or effort on is far stronger than one they would merely agree is annoying. If you can't describe the problem without mentioning your solution, you haven't separated the two yet.
Step 2Know exactly who you're addressing
"Everyone" is not a customer. Narrow it to a specific group: who is affected most, who feels it often enough to act, and who actually pays. Those are not always the same person.
Try to finish this sentence: "My customer is a [type of person] who [situation] and struggles with [problem]." Start narrow. You can widen later, but a plan aimed at everyone usually persuades no one.
Also work out where to find these people: the communities, places and routines they already have. That tells you who you can talk to next.
Step 3Talk to people who have the problem
This is the single most useful step, and the one most people skip because it feels uncomfortable. A few rules make these conversations worth having:
- Talk to people who actually have the problem, not friends and family, who tend to be kind rather than honest.
- Ask about the past, not the future. "How do you handle this today?" and "What did you try last time?" tell you far more than "Would you use this?" People are generous about what they might do.
- Don't pitch. If you spend the conversation explaining your idea, you're collecting compliments, not information.
- Listen for strong signals. Someone who already pays for a workaround, asks when they can have it, or offers an introduction is telling you something. A polite "that sounds great" isn't.
There's no magic number. For some ideas, five conversations reveal an obvious pattern; others need many more. What matters is whether you keep hearing consistent evidence from people who actually have the problem.
Step 4Research the market around them
Market research comes after the conversations, not before. Conversations tell you whether your idea fits real people's lives. Research tells you how big the opportunity is and who else is in it. Keep it light: do enough to make decisions, not enough to feel busy.
- Competitors and alternatives. Include the unglamorous ones, like spreadsheets, doing nothing or hiring someone. Look at their real prices, their reviews and what their customers complain about.
- Market size. You need a rough idea of how big the opportunity is, and a source you can point to. You don't need a forty-page report. Check any number you use against where it originally came from.
Step 5Check the money works
Settle on a price and the reason for it, such as what it replaces or what customers already pay. Then list what it costs you to deliver, and work out roughly how many customers you need to break even.
A back-of-envelope sum is enough. The point isn't precision; it's finding out what has to be true for this to work.
Step 6Test your riskiest assumptions
The steps above all produce assumptions. Write them down, then rank them by how badly the idea would suffer if each one turned out to be wrong. Test the riskiest first, with the cheapest test that gives you a real answer.
Are you ready to write your business plan?
You don't need every answer. You need enough evidence to know which parts of your plan are based on evidence and which are still assumptions. Run through this honestly. If you can tick most of it, you're ready to write. If a few boxes are empty, that's not failure, it's your to-do list.
And expect the plan to change. It's a snapshot of what you know today. Saying "we haven't tested this yet, and here's how we will" builds more trust than hiding the gap.
A few more questions
What if I don't have enough information yet?
That's normal. You don't need certainty before writing a business plan. You need to know what you know, what you don't know, and which unknowns matter most. Those gaps become your next research or testing priorities.
How long should this take?
For most people, a few weeks of part-time effort. If it's dragging on for months, you're probably researching to avoid the uncomfortable part, which is talking to people.
Do I need a finished product to validate my idea?
No. You can test demand long before you build anything. Start with conversations and a simple description of what you'll offer. Then try a waitlist, a pre-order or a small paid pilot.
What if customers don't respond the way I hoped?
That's the process working. It's far cheaper to learn it from ten conversations than from a launch. Change the problem, the customer or the offer, then test again.
Can I write the plan and validate at the same time?
Yes, and it often works well: write a section, notice what you can't back up, go and find out, then return. Just don't treat the draft as finished until the guesses have been replaced with evidence.
Where 4W1N fits in
It isn't a blank page and a prompt. 4W1N is a structured process for doing the thinking that should happen before and alongside your business plan. Five guided workshops ask you one specific question at a time.
Four "Reality Checks" are built in where you'd otherwise be guessing: Commercial Logic, Conversations, Test Run and Traction. Workshop 2 also has optional live market research, with a source link beside every figure so you can check it yourself. Nothing it finds is added to your plan automatically. You choose what to use.
At the end, the work you've done becomes whichever of these you need:
- A complete Business Plan
- A Marketing Strategy
- A one-page Investor Teaser
- A Startup Launch Plan
- A Pitch Deck, as downloadable slides
Each one is written from your own answers, so there's real thinking behind it.
You can follow everything in this guide without us. But if you'd like a guided structure that ends with your business plan, that's what we built.