The focus of the retirement phase is the successful removal of a system from production. Systems are removed from production for two basic reasons:
They are no longer needed. An example of this is a system that was put into production to fulfill the legal requirements imposed by government legislation. Now that the legislation has been repealed, the system is no longer needed.
The system is being replaced. For example, it is common to see homegrown systems for human resource functions replaced by commercial off-the-shelf (COTS) systems.
Activities of the retirement phase include the following:
A comprehensive analysis of the existing system to identify its coupling to other systems.
A redesign and rework of other existing ...