parallelrunning
Parallel running is a transition strategy in which an organization operates both the existing system and a newly implemented system concurrently for a defined period. The objective is to compare outputs, validate data, and ensure that the new system behaves correctly before decommissioning the legacy system.
It is commonly used during software or ERP implementations, data migrations, and regulatory or policy changes.
The approach requires careful planning: define scope and duration, select critical processes or transactions, align master
Benefits include reduced risk, early detection of issues, improved data quality, and a smoother transition for
Best practices include limiting the scope to essential functions, performing thorough data reconciliation, automating tests where
Alternatives to parallel running include direct cutover (big bang) or phased rollout. See also: cutover, big