By Teresa Torres · producttalk.org · @ttorres on X · LinkedIn
This reading guide kicks off a monthly book club celebrating five years of Continuous Discovery Habits, focused this month on Chapter 10, 'Testing Assumptions.' The guide frames the chapter as a bridge between identifying assumptions and actually testing them, warning teams not to rush into experiments without slowing down enough to design them well. Its main ideas are testing sets of assumptions across multiple ideas to counter bias, simulating experiences to observe behavior, setting specific success criteria upfront, and starting with small early signals. The post also provides discussion prompts and exercises to apply these habits to a team's current work.
01Key takeaways
- Test several assumptions across multiple ideas rather than one idea at a time to reduce confirmation bias.
- Simulate a real experience and observe actual behavior instead of relying on what customers say they would do.
- Define success criteria with specific numbers before running a test so someone else could call the result.
- Start with small, fast tests that yield early signals before investing in large-scale experiments.
- Treat false positives and false negatives as expected parts of testing rather than reasons to avoid it.
- Keep assumption tests small enough to finish in a day or two; shrink the test if it cannot.
02Key sections
- About the book club
- The author explains the monthly structure: reading chapters, discussion questions, team exercises, and community calls. Readers can join at any time.
- What Chapter 10 covers
- The chapter addresses testing multiple ideas to reduce bias, designing tests that simulate experiences, defining success criteria in advance, and preferring small early signals to large experiments.
- Individual and team reflection
- Prompts ask readers to examine whether their past tests had upfront success criteria, whether they tested whole ideas or specific assumptions, and how ambiguous results could have been avoided.
- Hands-on exercises
- Readers design a small assumption test that can run in 1-2 days and audit recent tests to see whether their success criteria were specific enough to act on.
- Supplementary resources
- The guide lists related in-depth material, supplementary articles, and outside books on testing business ideas and lean UX, plus an audio summary for paid subscribers.
03From the post
“Continuous Discovery Habits* turns five this year. And to celebrate we are reading the book together. Each month, I am releasing an in-depth reading guide that includes: - The chapters we will be reading - A preview of the most important concepts we'll be learning about - Short videos you”
04Frameworks mentioned
Summary and takeaways written by PM Atlas; quotes are short excerpts. © the original author.