chapter. 7. Maintenance. This final phase takes place once the implementation phase is complete. In the maintenance phase the system has a structured support process in place. Reported bugs are fixed and requests for new features are evaluated and implemented. Also, system updates and backups of the software are made for each new version of the program. Since maintenance is normally an Operating Expense (OPEX) while much of development is a Capital Expense (CAPEX), funds normally come out of different budgets or cost centers.
The SDLC method (click to enlarge) The SDLC methodology is sometimes referred to as the waterfall methodology to represent how each step is a separate part of the process. Only when one step is completed can another step begin. After each step an organization must decide when to move to the next step. This methodology has been criticized for being quite rigid, allowing movement in only one direction, namely, forward in the cycle. For example, changes to the requirements are not allowed once the process has begun. No software is available until after the programming phase. Again, SDLC was developed for large, structured projects. Projects using SDLC can sometimes take months or years to complete. Because of its inflexibility and the availability of new programing techniques and tools many other software development methodologies have been developed. Many of these retain some of Information Systems for Business and Beyond (2019) pg. 204
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