I've had to do this once. They don't teach you managing code like this! A friend gave me a copy of Working Effectively With Legacy Code[0] which helped me. The

I've had to do this once. They don't teach you managing code like this! A friend gave me a copy of Working Effectively With Legacy Code[0] which helped me. The gist of it: a strong suite of integration and unit tests. Isolate small code paths into logical units and test for equivalency. [0] http://www.amazon.com/Working-Effectively-Legacy-Michael-Feathers/dp/0131177052 http://www.amazon.com/Working-Effectively-Legacy-Michael-Fea...