“The hardest single part of building a software system is deciding precisely what to build.” —Fred Brooks

This book is about figuring out what to build – starting with the goals of people paying for the software to be built, through to he people using it and their goals, then on to the way they might use software to reach their goals. And then finally to designing and validating a proposed software user interface - the "what to build." That's outside-in. Software development processes that start from what to build are inside-out.

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