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This article throws light upon the top four approaches to System Conversion. The Approaches are: 1. Direct Conversion 2. Parallel conversion 3. Modular Conversion 4. Phase-In Conversion.
System Conversion Approach # 1. Direct Conversion:
Direct conversion is the implementation of the new system and the immediate discontinuance of the old system.
This conversion is possible when:
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(a) The system is not replacing any other system.
(b) The old system is judged absolutely without value.
(c) The new system is either very small or simple and
(d) The design of Ike new system is completely different from that of the old system.
System Conversion Approach # 2. Parallel conversion:
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It is an approach wherein both the old and the new system operate simultaneously for some time. The outputs from both the systems are compared and difference is reconciled. The advantage of this conversion is that it gives a high degree of protection to the organization from the failure in the new system and has gained a wide spread popularity.
The disadvantage will be the costs associated with duplicating facilities and the personnel to maintain the dual systems. This conversion is opposite of direct conversion.
In parallel conversion a target data should be set to indicate when this conversion can be withdrawn and the new system will operate on its own. If the differences occur between the old and new systems, it should be verified with the same inputs to make sure of the transaction.
System Conversion Approach # 3. Modular Conversion:
The implementation of the new system takes place section by section. For example, it first can be installed in one sales region and if proved successful, the same can be installed in the second sales region and so on.
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The advantages of this conversion are:
(a) The risk of system’s failure can be localized.
(b) The problems occurred in the system can be rectified before further implementation.
(c) Other operating personnel can be trained before the implementation at their location.
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The disadvantage is that this conversion is that the period of the conversion in very lengthy and is not feasible for every system or organization.
System Conversion Approach # 4. Phase-In Conversion:
Phase-In conversion is similar to the Modular Approach but here the system itself is segmented and not the organization as in Modular Approach. The new data collection activities are implemented and an interface mechanism with the old system is developed. This interface allows the old system to operate with the new input data. Like this, separate segments are installed until entire system in implemented.
The advantage of this is that the rate of change in a given organization can be minimized and the data processing resources can be acquired gradually over an extended period of time. The disadvantage is that the costs are incurred to develop temporary interfaces with old systems.
