Testing Business Ideas
David J. Bland and Alexander Osterwalder
Reduce business risk by testing assumptions, running over 40 practical experiments, and using real customer evidence to validate ideas.

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Outline
What's it about?
Testing Business Ideas (2019) is a practical guide to reducing the risk of new business ideas by testing them before investing heavily. David J. Bland and Alexander Osterwalder show how to identify the assumptions behind an idea and present forty-four experiments for testing whether customers want it, whether it can be built, and whether it can be profitable. The book is designed for entrepreneurs, innovators, and teams in organisations of all sizes.
Key ideas
- Every new business idea rests on assumptions, and the first job is to identify them before spending heavily.
- Testing an idea early, before major investment, is how you reduce the risk of building something that fails.
- The book presents forty-four experiments that help you check whether customers actually want your idea.
- The same experiments also test whether the idea can be built and whether it can be profitable.
- Real evidence from customers should guide your decisions, not opinion or hope.
About the author
David J. Bland and Alexander Osterwalder combine experience in startups and business strategy. Bland is an adviser who helps companies test new ideas, and Osterwalder is a Swiss business theorist and cofounder of Strategyzer, known for creating the Business Model Canvas. Osterwalder’s other books include Business Model Generation.
Questions people ask
What is Testing Business Ideas about?
It is a practical guide to lowering the risk of new business ideas by testing the assumptions behind them. David J. Bland and Alexander Osterwalder present forty-four experiments to do this.
Who is Testing Business Ideas for?
It is written for entrepreneurs, innovators, and teams in organisations of all sizes. Anyone with a new idea they want to check before investing heavily can use it.
How long is the Durar summary of Testing Business Ideas?
The Durar summary takes about 15 minutes to read or listen to. It covers the book's main approach to identifying assumptions and testing them with real customer evidence.
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