This is a classic that no entrepreneur should leave unread. It describes how the most agile companies build fast feedback loops into their operations to achieve differentiated results. It's a primer on the Silicon Valley approach to product development, market validation, and business building.

This is easily a must-read for anyone building a startup or creating a new product. I think of The Lean Startup as the "philosophy" behind the modern tech community today. The reality is, you can't go a day in a startup without talking about Lean Startup methods in some form. Quintessential startup reading.