About 75% of maintenance costs are spent for providing enhancements (in the form of adaptive and perfective maintenance) (Martin, 1983; Nosek & Palvia, 1990; van Vliet, 2000).
Why should your care?
Annual software maintenance cost in USA has been estimated to be more than $70 billion (Sutherland, 1995; Edelstein, 1993).
End users usually make their requests by email, voice mails or notes dropped on desks. When IT fails to deliver their requests, the finger pointing begins. If a formal system is used at all, it is a help desk or bug tracking system.
Neither works well because user defined changes and enhancements require specialized software.
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