Did the non-TDD team do regular testing, or no testing at all? It doesn't say, and it seems rather important to judge the results.. I think the debate is not w

Did the non-TDD team do regular testing, or no testing at all? It doesn't say, and it seems rather important to judge the results.. I think the debate is not whether testing in general reduces defects (which is rather obvious), but if adhering to a stringent Test-Driven Development (TDD) process is better than regular testing (typically adding the tests after writing the code, instead of before).