A much better book is Running Lean by Ash Maurya. It defines a process for systematically derisking your startup as follow: 1) Create a lean canvas for your bu

A much better book is Running Lean by Ash Maurya. It defines a process for systematically derisking your startup as follow: 1) Create a lean canvas for your business and identify the riskiest/most uncertain area. 2) Do systematic problem interviews to validate your problem. 3) Do systematic solution interviews. It's a great read for people who are confused about lean methodology, don't know how to get started, or got burned by doing lean "wrong".