Appendix B. A Model of Lean-Agile Software Development

“As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.”  —Albert Einstein

We have always found it useful to create a model of our thinking. This both sharpens our understanding of things as well as gives us frequent opportunities to check its validity. While one should not work off a model as truth without understanding it, very often, the extra awareness that a model brings is useful—it allows us to take advantage of our intuitive knowledge by bringing it to the surface. As with all models, this one will change. Please refer to the book’s web site ( to get the latest version.

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