A reason to read
Eric Ries’s The Lean Startup focuses on learning under uncertainty. His official methodology page explains the build–measure–learn cycle and the role of a minimum viable product in testing a business assumption. The important reading question is what evidence would help you decide whether an idea deserves more work.
The official book page identifies the book and author. The five videos below come from Ries’s 2009 Stanford talk: one full lecture and four separately published clips. They overlap, and they predate the book. Choose the full lecture for context or the clips for focused study; they are not five independent book reviews.
Before you read
Write down one proposed service or product and the person it is meant to help. Separate a belief about the problem from a belief about your solution. “A shop owner spends too long updating opening hours” is one assumption. “They want my subscription app” is another.
Which assumption would make the project pointless if it were false? Start your notes there. An experiment is useful when its result could change your next decision, including a decision to stop or narrow the idea.
SelfGrowthVideos practice: an assumption card
This is our original planning exercise, not an official Lean Startup template.
- Write one uncertain assumption in a sentence. Name the specific person or situation it concerns.
- Describe what you could observe if it were true. Keep an observation separate from a polite compliment about your idea.
- Design a small, honest trial: a paper sketch someone can respond to, a demonstration using sample data, or a conversation about how they currently handle the task.
- Decide what result would make you revise the idea before conducting the trial. Set a limit on the time or money you are willing to spend.
- Record what you actually observed and the next decision it supports.
For example, before building a booking tool, sketch a booking flow and ask someone who handles bookings to walk through a recent real request. Note the steps your sketch omits. A single conversation cannot establish market demand, but it can expose a mistake worth correcting before further work.
Review your evidence
What changed in your understanding? Which assumption is still untested? Did your trial reveal a real problem, or only interest in the concept? Decide on the next bounded question rather than treating one favorable response as proof of success.
Explore side-hustle learning areas, AI for practical work and The Growth Shelf for related study paths.