An evergreen almanac for the aspiring entrepreneur. Yet the always up-to-date builder in founder mode won’t learn much.

Eric Ries bestseller The Lean Startup was first published in 2011. It is still a valuable read 14 years later. To start out with a definition of the term ‘startup’, Ries defines it as:
A startup is a human institution designed to create a new product or service under conditions of extreme uncertainty.
I found this an important differentiator from contemporary methods that tend to downplay the human element faced with seemingly insurmountable challenges. James Clear wrote in his book Atomic Habits that
You do not rise to the level of your goals. You fall to the level of your systems.
Understanding our human fallibility encourages the creation of systems that are capable of withstanding conditions of extreme uncertainty. I remember this quote often for it is hard to be disciplined and easy to quit. Ries main argument in The Lean Startup centers around mitigating the emotional element by building a product with a mindset that is obsessed with rapid iterations and experiments, validated learning, and not falling in love with the product but the problem.
The Lean Startup method is designed to teach you how to drive a startup. Instead of making complex plans that are based on a lot of assumptions, you can make constant adjustments with a steering wheel called ‘Build-Measure-Learn’ feedback loop. Through this process of steering, we can learn when and if it’s time to make a sharp turn called a ‘pivot’ or whether we should ‘persevere’ along our current path.
Ries describes the ‘Build-Measure-Learn’ feedback loop. It’s a method used by most contemporary startups: create a dirty product (the so-called minimum viable product) that can be built fast, share it with your ideal target customer, track and measure how and whether they use the product, and learn from the customer feedback to inform your product roadmap. In the example of the shoe e-commerce store Zappos, its founder assumed people would want to buy shoes online. To validate his hypothesis he went to visit physical shoe stores, ask for permission to take pictures of shoes, and post those pictures online. When a user would want to order a pair, he would go back to the store, buy the pair, package and ship it. Today Zappos is owned by Amazon and valued at more than a billion dollars.
Only 5% of entrepreneurship is the big idea, the business model, the whiteboard strategizing […]. The other 95% is the gritty work that is measured by product prioritization decisions, which customers to target and listen to, and having the courage to subject a grand vision to constant testing and feedback.
Grit is one thing. Grit informed by validated customer feedback and directed towards the problem the product is trying to solve is everything. This idea of falling in love with the customer’s problem is so obvious and known all-around that most founders will fall prey to their shiny product with curated color theme, intricate feature functionality, and the hours spent on building it when later on nobody wants (to pay for) it. Y Combinator’s slogan is ‘Make something people want’, not what you think they would want.
A startup’s job is to (1) rigorously measure where it is right now, confronting the hard truths that assessment reveals, and then (2) devise experiments to learn how to move the real numbers closer to the ideal reflected in the business plan.
To conclude, The Lean Startup remains a powerful reminder that entrepreneurship is a journey of disciplined exploration rather than blind ambition. By focusing on validated learning, Ries provides a roadmap that urges founders to confront reality and make informed adjustments along the way. It is hard to build a great product or service. While seasoned entrepreneurs may already recognize the importance of rapid iterations and customer obsession, The Lean Startup presents these concepts in a way that’s both actionable and refreshingly human-centered. I omitted the treasure trove of stories Ries included, but it’s an invaluable guide for anyone willing to approach innovation with humility, resilience, and a willingness to embrace failure as a step toward lasting success. Similar, more modern, methods to build a startup are distilled under the regime of Founder Mode or Netflix’s Culture Memo.



