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Services
>> Software Conversion & Migration
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The conversion of a legacy information system to new technologies
poses specific challenges, among which are:
- Discontinued
software development tools working on legacy operating environments
- Disintegrated
software modules with overlapping or missing functionality
- The
need of seamless transition from a legacy system to a new system
while maintaining day to day operations and data integrity
CST's Legacy System Conversion procedure is tailored to each
client's case; still it normally comprises the following steps:
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Initial analysis step allows sufficient understanding of the original
application functionality
- Functional
decomposition of the original application. Examples of the defined
functional components are screens, reports, etc.
- Classification
of the original application functional components
- Selection
of the defined functional components, which should be ported to the
new application. This step may require extensive discussion and agreement
with the customer
- Development
of the system conversion specification. This comprehensive document
in particular indicates change requirements to the original functionality
and new required features
- Development
of proper data conversion mechanisms allows identification of and
resolution of data inconsistency problems A Parallel Run step including
compatibility checklists is often required to make sure that original
application correctly reproduces the legacy system functionality.
The Parallel Run normally requires a defined period of concurrent
use of both legacy application and the new system on the same data
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