Objectives: Introduction Over View of System Analysis and Design
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- 9.3.1.1 Parallel systems
| 9.3 Conversion Conversion is the process of changing form the old system to the new one. 9.3.1 Conversion Methods There are four methods of handling a systems conversion (Table 9.1). Each method should be considered in light of the opportunities that it offers and problems that it may cause. However, some situations dictate the use of one method over others, even though other methods maybe more beneficial. In general, systems conversion should be accomplished as quickly as possible. Long conversion periods increase the possible frustration and difficulty of the task for all persons involved, including both analysts and users. 9.3.1.1 Parallel systems The most secure method of converting from an old to new system is to run both systems in parallel. Under this approach, users continue to operate the old system in the accustomed manner but they also begin using the new system. This method is the safest conversion approach, since it guarantees that, should problems such as errors in processing or inability to handle certain types of transactions arise in using the new system, the organization can still fallback to the old system without loss of time, revenue, or service. The disadvantages of the parallel systems approach are significant. First of all, the system costs double, since there are two sets of systems costs. In some instances it is necessary to hire temporary personnel to assist in operating both systems in parallel. Second, the fact that users know they can fallback to the old ways maybe a disadvantage if there is potential resistance to the change or if users prefer the old system. In other words, the new system may not get a fair trail. All in all, the parallel method of systems conversion offers the most secure implementation plan if things go wrong, but the costs and risks to a fair trail cannot be overlooked. |