[rco8786]

> In the grand scheme of things adding a week to a 6 week project isn't that big a deal

mmm maybe once. But that's a compounding delay. If every project is delayed by ~15% for TDD then over the course of years you can fall well behind your competitors.

> complex enough application small changes might result large bugs

Totally agree - but also on really tightly TDD-tests code bases small changes can result in huge test refactorings...many times to the point of just not doing something because the time to update the tests is prohibitively expensive.

There's a balance to all of this, and (empirically) TDD seems to be on the extreme end of the balance.