Read The Lean Startup

The Book

The Lean Startup by Eric Ries was published in 2011 and remains one of the most important books a founder can read. Its core argument: startup success is not luck — it can be engineered, learned, and taught.

Key Ideas

Build-Measure-Learn

Ries synthesises lean manufacturing, design thinking, customer development, and agile development into a single loop: build a small thing, measure how customers respond, learn from it, and repeat. The goal is to eliminate waste — time and money spent building things nobody wants.

"Startup success can be engineered by following the right process, which means it can be learned, which means it can be taught."

Start With the Customer

Build a great company by starting with customers — through interviews and discovery research — before writing a single line of code. The MVP is a learning vehicle, not a finished product.

"Success is not delivering a feature; success is learning how to solve the customer's problem."

The Five Whys

A method originally developed by Toyota to reach the root cause of any problem. Ries applies it to startups. Example from his Harvard Business Review article:

1. A new release broke a key feature for customers. Why? A particular server failed.
2. Why did the server fail? An obscure subsystem was used incorrectly.
3. Why was it used incorrectly? The engineer didn't know how to use it properly.
4. Why didn't he know? He was never trained.
5. Why wasn't he trained? His manager doesn't believe in training new engineers because they are "too busy."

The actual root cause was a management assumption, not a technical failure. Five Whys surfaces those assumptions before they become recurring disasters.

The Takeaway

An MVP tested quickly and iterated on rapidly produces less waste and a faster path to product-market fit. Do not spend months building in isolation — get into the feedback loop as early as possible.