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•Defects in the system after its delivery. This involves any errors or bugs in the newly implemented system e.g. use of wrong formula within a system
•Environment change e.g. a government tax policy may change which would influence a change of payroll system
•A change in user requirement. A business organization exist in a changing environment, therefore the user requirements change e.g. a payslip in a payroll system may initially be required to show the employee corporate share amount
•Poor documentation of the system. A system may be changed and its documentation rewritten in order to improve it is maintainability.
Steve ju answered the question on October 10, 2018 at 19:12
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