Sadly, like marketing, it's really hard to give definites with testing. Or any other good programming practice, for that matter. The best you might do would b

Sadly, like marketing, it's really hard to give definites with testing. Or any other good programming practice, for that matter. The best you might do would be to come up with examples of people who used unit testing and things came out beautifully because of it. Things rarely turn out that beautifully without testing, so it can be pretty convincing to anyone who has dealt with software development for any length of time.