Testing method used for combining old and new systems → ?

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Testing method used for combining old and new systems → ? Answer: Parallel Testing / Parallel Running

Parallel Testing (Parallel Running) is a system testing method in which the old system and the new system operate simultaneously for a period of time. The results of both systems are compared to ensure the new system works correctly before completely replacing the old one.

Question context

This question is part of 🗃️ Database within the broader 🖥️ Software Engineering subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.