Legacy code is a burden that few developers are lucky enough to avoid in their professional lives. We'll look at how legacy code develops and some of the early warning signs to watch out for. Where it's already a problem, we'll explore the strategies that can be used to replace, isolate or integrate that code and some practical methods for achieving it. This talk will weigh these ideas up in terms of time and cost to help you take a pragmatic approach to taming or slaying your monster.