There's three ways. One is the git way, which is to let people do whatever and then ask them to handle it afterwards. The next best is used by some other annoyi

There's three ways. One is the git way, which is to let people do whatever and then ask them to handle it afterwards. The next best is used by some other annoying system I used early in my career, which is to require people to check out a file before they can get write permission on it, and only allow one person to have write permission at once, so that there's no real risk of merges. And the worst of all is to just let whoever comes later overwrite whatever was there before.