First you start treating each event/operation as a fundamental part of your problem. Each Event can then have a opposite reverting Event. So if you want to reve

First you start treating each event/operation as a fundamental part of your problem. Each Event can then have a opposite reverting Event. So if you want to reverse an action, you can just apply the opposite event. You can also display a list of recent events that have taken place easily: - user X modified article Z - user Y deleted article Z (revert?) Note that I've only studied this in passing, and have never applied this in practice, so I can't answer just how effective this could be. Also not really sure how this works when other actions have already taken place, or how you can detect if an event cannot be recovered from (if there is such a thing).