Testing Business Ideas by David J. Bland and Alexander Osterwalder, published by Wiley in 2019, is a field guide to the experiments that tell you whether a business idea will work. It belongs to the same Strategyzer series as Business Model Generation and Value Proposition Design, and it fills the gap those books left: how exactly to test the boxes on the canvas.
What is Testing Business Ideas about?
Bland, who has spent years coaching companies on lean startup methods and design thinking, starts from the high failure rate of new products. His answer is a disciplined loop: design the idea, find the assumptions it rests on, test them, learn and adapt. The book combines the canvases from the earlier Strategyzer books with assumptions mapping and lean startup experiments.
The book has four parts: design, test, experiments and mindset. Design covers the team and the idea, shaped on the business model and customer canvases. Test introduces assumptions mapping, which sorts every assumption by how important it is and how much evidence you have, and splits risk into three types: desirability (do customers want it), feasibility (can you build and deliver it) and viability (can it make money). The experiments part is the heart of the book, a library of tests from customer interviews, search trend analysis and paper prototypes to presales, mock sales, crowdfunding and services run by hand behind a fake front. Each test card lists cost, setup time, run time and how strong the evidence is. The mindset part covers team habits and common pitfalls.
What makes it different is the format. It is a reference you open when you need a test, laid out visually so a team can pick one in a meeting and run it the same week.
What are the main lessons for founders?
- Map before you test. Put every assumption on a grid of importance against evidence. The top-left corner, important and unproven, is where you start.
- Name the risk type. A desirability risk needs customer tests, a feasibility risk needs technical tests and a viability risk needs pricing and cost tests. Mixing them up wastes time.
- Sequence experiments. Start with fast, cheap discovery tests that point the way, then run validation tests that ask for real money or commitment.
- Write a test card. State the hypothesis, the test, the metric and the success line before you start. Afterwards, write a learning card with what you found and what you will do.
- Weigh the evidence. What people say is weak evidence. What they do, especially when they pay, is strong.
Who should read Testing Business Ideas?
It suits founders who have done some customer interviews and now need to test demand, pricing or delivery more seriously, plus product teams and corporate ventures that run many experiments. Teachers and accelerator mentors use it as a shared menu of tests for their cohorts.
First-time founders who have not spoken to any customers should start with The Mom Test and come back later. Teams that already run regular experiments will know most of the library.
How do you put Testing Business Ideas to work this week?
- List 10 assumptions behind your idea and place each on an importance and evidence grid.
- Pick the most important, least proven one and choose a test that fits your budget and a 7-day window.
- Fill in a test card with the metric and success line, run the test and write a learning card on Friday.
If your test is a landing page, the free Landing Page module in the F/MS Startup School shows how to build one that measures real interest.
Where does Testing Business Ideas fall short?
Each experiment gets only a few pages, so you learn which test to pick but need other sources to run it well. The book assumes you know the Strategyzer canvases, and the visual layout can feel like a slide deck rather than a guide. Many examples suit larger companies with budgets for multiple tests at once. It also says little about the ethics of fake doors and simulated services, where customers can feel misled. For running the interviews well, read The Mom Test, and for a lighter take on the same idea, The Right It.