[Skunkworks] Procedure for retiring legacy systems

Hi guys, Anybody with a go-to place where i can get a 'retiring legacy system' procedure 'for dummies'? I'm drawing up one for the organization only that i'm afraid i've only taken care of the data effectively but not treated the application 'respectably'. :-) -- Believe: - To accomplish great things, we must not only act, but also dream; not only plan, but also believe ----Anatole France