Unformatted text preview: to the new
system takes place incrementally over a period of time. The new system is
gradually implemented part by part and the old system is gradually phased out.
The results produced by each part of the new system are compared against the
results of the old system. Any discrepancies or errors found are checked and
removed. Once confidence is developed in a particular part of the new system, that
part of the new system is phased in and the corresponding part (operations) of the
old system is phased out. This approach is continued for each and every part of the
new system. Thus, over a period of time, the new system is gradually phased in,
while the old system is gradually phased out.
This method is not as expensive as the parallel run method because the changeover
process being gradual can usually be handled with existing manpower. Moreover,
there is no danger of interruption of work if there are problems with the new
system because the corresponding part of the old system is still in operation. The
users also get sufficient time to become acquainted with the new system. Hence,
they can confidently handle the new system when the complete system is handed
over to them.
This method, however, cannot be used in situations where the time period supplied
for conversion process is very less or when the new system significantly differs
from the old system. SYSTEM EVALUATION
Once the new system is implemented and put in operation, it is necessary to
evaluate the system to verify whether or not it is meeting its objectives. These
objectives of the system are clearly stated during its problem analysis and system
planning phase. The post implementation system evaluation is normally carried
out by people who have an independent view point and are not responsible for the
development and maintenance of the system. While evaluating a system, the
following points are normally considered:
1. Performance Evaluation. The performance of the new system is evaluated
and compared with the performance of the old system. In general, the new system
should be at least as efficient as the old one in performance. In case of any slack,
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This document was uploaded on 04/07/2014.
- Spring '14