> So I proposed this to my manager, and he responded: we tracked all bugs in our system for the last 10 years, and when you look at fixed bugs that get broken a

> So I proposed this to my manager, and he responded: we tracked all bugs in our system for the last 10 years, and when you look at fixed bugs that get broken again, it only occurred very rarely. So in the end, doing that was not the best investment of effort. That sounds very hand wavy. It is making the assumption that: - your bug tracking system and people are so good that they have found all the duplicate tickets. - they don't make mistakes and find all duplicates for tickets. - your code is so good that it hasn't had any side effects that caused regressions. - your boss is so good that he has a full grasp on 10 years worth of bugs. edit: formatting