Parallel conversion is a system deployment method where the new system is implemented and runs alongside the old system for a period of time. This method allows for:

Comparison of outputs: Ensuring that the new system produces the same or better results as the old system.

Risk reduction: If there are issues with the new system, the old system can still be used without interrupting business operations.

User adaptation: Users can get accustomed to the new system while still having access to the familiar old system.

Parallel conversion is often used to minimize the risk associated with deploying a new system.

References

Harold Kerzner, "Project Management: A Systems Approach to Planning, Scheduling, and Controlling," Wiley.

Kathy Schwalbe, "Information Technology Project Management," Cengage Learning.