IS Cutover Approaches

Immediate (direct)

    The old system stops running and the new system begins at a specific point in time.

Advantages

Disadvantages

Used

    For most small systems, most upgrades, highly integrated large systems with significant on-line components.

Phased by location

    The new system is installed one at a time, or in small groups, across similar separate locations. Within each location, the cutover is immediate.

Advantages

Disadvantages

Used

    For larger on-line systems where similar units exist (such as retail bank locations). Start with simplest and smallest units first and move to larger, more complex units.

Phased by function

    Modules (functions) of the system are installed one at a time. Usually starts with modules with greatest data entry and then follows data.

Advantages

Disadvantages

Used

    For larger on-line systems where phased by location is practical.

Parallel

    New system is started while old system is continued. Both old and new run simultaneously until there is confidence in new system.

Advantages

Disadvantages

Used

    For larger batch systems.

 

© Copyright 2001 Raymond S. Kulzick. All rights reserved. 011108.

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Copyright © 2001 Kulzick Associates, PA - Last modified: September 13, 2008