"....a migration strategy for replacing the legacy system."   #readingToday  

We describe how a small, successful, self-selected XP team approached a seemingly intractable problem with panache, °air and immodesty. We rewrote a legacy application by delivering new features, a radically different approach to those previously applied. This proved to be a low cost, low risk proposition with a very high payoff for success. Most importantly it provided users with new functionality quickly that could never have been retrofitted into the legacy system. In the longer term it may give a migration strategy for replacing the legacy system.