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> TDD can help keep a developer focused - and this can help overall productivity rates - but it doesn't directly help lower defect rates.

We would need to reference some data with statistical power; though randomization and control are infeasible: no two teams are the same, no two projects are the same, no two objective evaluations of different apps' teams' defect rates are an apples to apples comparison.

Maybe it's the coverage expectation: do not add code that is not run by at least one test.




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