When I wrote the first edition, it was before Agile was well estab-lished in product companies, and before Customer Development andLean Startup nomenclature became popularized. Today, most teamshave been using these techniques for several years and are more inter-ested in what’s beyond Lean and Agile, which is what I focus on here

In the first edition, I focused more on startups. In this edition,however, I wanted to expand the scope to look at the challenges ofgrowth-stage companies and how product can be done well at large,enterprise companies.

But soon we began to ask ourselves some very important questions:Who decides what products we should build? How do they decide?How do they know that what we build will be useful?