Sometimes it happens that code is moved between repositories in a way that doesn't preserve each single commit. DVCSs are designed to overcome this problem, an

Sometimes it happens that code is moved between repositories in a way that doesn't preserve each single commit. DVCSs are designed to overcome this problem, and there are bridges between various DVCSs, but sadly this still happens. So, while mastering '<yourvcs> blame' is certainly useful, you shouldn't rely too much on it, and write readable and well documented code.