[ericHosick]

I think one problems with TDD is that it doesn't lean towards testing bugs in a feature/scenario (describing the whole design). That is, TDD focuses on testing a unit and it is effective/fast at testing the fringe cases of units.

Behavior Driven Development really shines in the aspect of "completely describing the design" as it focuses on driving development against a well defined behavior (using scenarios). BDD lets you know where the bug is: in the code or in the specifications (the behavior as specified by the customer). So there is a lot less "chasing around". If you are trying to cover behavior of a system only using TDD then I agree you can end up chasing around a bug.

However, both are necessary and highly effective when used together.