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    The sample size is way too small to consider this to be scientific but I think it's representative of what lots of people experience. I find that when I do TDD, most of the extra time is spent fixing the bugs that cause my unit tests to fail, not writing the tests themselves. That's not really adding extra time, just shifting when you find and fix those issues. Any real extra time is in fixing problems that you wouldn't have found, at least not in the first go-round. Commented Jun 15, 2016 at 15:38
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    @JimmyJames It's a case study, which is used extensively in business, and a lot in science when it's not (yet) possible to run a large scale reproducible experiment. There's psychology journals full of them. "Unscientific" is not the right word. Commented Jun 16, 2016 at 2:12
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    Why do I think if the outcome of that case study had been showing the opposite, it would not have made it into the book ;-) ? Commented Jun 16, 2016 at 10:40
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    @DocBrown I wonder how many case studies were made and discarded before they found one with the right answers :-) Commented Jun 16, 2016 at 12:13
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    @djechlin I don't think conflating a statistically valid study and something that you can't even apply statistics to is helpful to humanity. We've got enough crappy unrepeatable research without further muddying the waters by calling the comparison of two uncontrolled situations 'scientific'. The term for this is 'anecdotal evidence'. It can pretty much guarantee I could find two projects that showed very different results simply because of the development teams involved. It wouldn't 'prove' anything. Commented Jun 16, 2016 at 16:48