Parents could either be required or be given an incentive to attend parenting classes. While this may not guarantee that their children won't be abused, it may help them learn other ways to cope. There really isn't too much you can do to prevent abuse if you don't know that it's happening. Another thing that could be done is that monitors be put throughout schools and parents be allowed to check in on their children over a monitor in the school or over the internet. People can train their children through "What if?" things or show them examples of what abuse looks like and what to do and who to tell if something happens to them.