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Are there any credible sources of information on the adoption of agile techniques like automated testing, continuous integration and refactoring?

Of those that are using unit testing, how many follow test first or test driven development.

I'm trying to determine how widespread these practices are.

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"credible sources"? What do you consider a "credible source"? – S.Lott Feb 14 '11 at 3:41
up vote 2 down vote accepted

This is a list of surveys about adoption of some of the technoques you asked:

If you need a survey about adoption of agile methodology in general, this is a good article:

Agile adoption and penetration rates are being overestimated. Although the number of companies that are adopting agile practices is, indeed, reasonably high, most organizations use agile in a very small percentage of their overall work.

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