I disagree with the assertion that TDD takes more time. TDD takes less time if you factor in the reduction of errors TDD helps prevent.

This article should be renamed, “TDD doesn’t work if you don’t do it right.”

This article seems to argue for Big Design Up Front. Ok, if you do that, then why not write the tests for those designs after you make the design – then the code you write confirms to the design.

I don’t think anyone advocates that writing tests is the same as the design process. Tests are the result of design not the other way around. The gray area is not design up front – but how much design up front.