3.2.3 Operational
requirements
3.2.3.1: Systems rollout
It entails the establishment of a migration/cutover strategy
from managing operations using equipments (hard and soft) of the existing
operations management system to managing operations using equipments (hard and
soft) the new PMS which contains
· Migration/cutover conditions
· Migration/cutover approach and a procedure with
advantages and disadvantages
· Migration plan
Migration/cutover could be
1. Direct cutover: Also called crash cutover or
abrupt cutover, where the old system is discontinued on a predefined date
(often corresponding to the start of a new accounting period) and the entire
organization switches directly to the new system. Direct cutover is risky
because, if the new system fails, returning to the old system is virtually
impossible. This strategy is relatively inexpensive, however, and it tends to
promote user acceptance since there is no old system to serve as a basis for
comparison..
2. Parallel operation: where the old
and the new systems run in parallel for a time and which tends to be the most
effective when a computer-based system replaces a manual (or partially manual)
system because concurrently running two computer-based systems is very
expensive and which gives makes an excellent choice when data accuracy,
security, and/or reliability are important concerns.
3. Gradual cutover: which is a combination of direct and
parallel cutover and where the idea is to run the new and old systems
concurrently and gradually increase the number of transactions handled by the
new system. Actually here, data is not processed twice; instead, some
transactions are processed by the old system, some are processed by the new
system, and the percentage sent to the new system gradually increases until the
old system fades away.
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