Agile / Technology

Are there any studies on the Efficiency/Effectiveness of Agile vs Waterfall?

This blog entry is a repost of an answer I wrote at

The book “Making Software: What Really Works, and Why We Believe It” takes a novel approach for a technology book. Instead of reading an industry veterans opinions of what works and why*, it decides instead to review currently available computer science to analyze many popular best practices. If you’re looking for good arguments about Waterfall vs. Agile, it has chapters on Agile methods including XP, Scrum, Dynamic Software Development, and Lean, with good scientific backing. It’s high quality, as you would expect from O’Reilly. One of the editors was the excellent Greg Wilson, a trusted computer science author, editor and presenter.

The book itself summarizes multiple research studies, including many on agile. One section summarizes research including “Are Two Heads Better Than One? On the Effectiveness of Pair Programming” by Dybå, T.; Arisholm, E.; Sjøberg, D.I.K.; Hannay, J.E.; Shull, F.; and “Empirical Studies of agile software development: A systematic review” by Tore Dybå and Torgeir Dingsøyr.

The general sense is that most agile practices are beneficial, but that the effects of pair programming and TDD and other agile tenants are not as strong as one might hope. There’s even a disturbing footnote that TDD may in fact be somewhat addictive*.

The book is a great way to get access to a lot of research that’s been done, all in one cohesive whole. There are a few blogs and other sites on the web that review the book.

* No offense intended. I’m a big fan of some of those industry veterans, and believe that many titles are absolute classics.

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