From cLabs Blogki:
Case studies done on 4 development teams (three at Microsoft, one at IBM) that have adopted TDD. Results of the case studies indicate that the pre-release defect density of the four products decreased between 40% and 90% relative to similar projects tha tdid not use the TDD practice. The teams subjectively said that they experienced a 15-35% increase in initial development time after adopting TDD. Very interesting paper.
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