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Disciplined Agile Delivery: A Practitioner’s Guide to Agile Software Delivery in the Enterprise by Mark Lines, Scott W. Ambler

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Chapter 2. Introduction to Agile and Lean

Important agile philosophy: If something is hard, do it more often so that you get good at it and thereby make it easy.

The first generation of software development methodologies has been described as “waterfall” or “traditional.” They are plan-driven, serial processes that assume that software development is comprised of a series of tasks that are easily identified, predictable, and repeatable. History has shown that this is clearly not the case. Unlike other engineering disciplines, software is a creative science that requires some degree of invention and carries a material level of risk and uncertainty on almost every nontrivial project.

The second generation of software development methodologies has ...

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