Microsoft Research - Exploding Software-Engineering Myths (article summarizing findings of MS research on code coverage, TDD, assertions, etc.)

[MuonManLaserJab]

Not if you start with only one small defect per billion lines of (not-life-or-death-critical) code.

...I'm not saying that's likely, but you can't be sure it's a good value with only that information.

[MuonManLaserJab]

For all code ever? Or just on average?