An organization should periodically examine the system in its production environment to determine whether the system is continuing to satisfy users’ needs. If it is possible to make the system work better, its value to users will increase. There are three different types of periodic examination:
- The post-implementation review is conducted to follow up a system’s recent implementation. This review is analogous to a follow-up examination that a doctor might perform after an operation.
- Systems maintenance, performed in response to a specific request, is conducted if the system has a relatively minor deficiency. This examination is similar to one a doctor performs on sick people.
- The periodic systems survey is undertaken whenever it is likely that the costs of the review will be less than the value of the improvements that the review will suggest. This reevaluation is like a periodic physical examination.