Final answer:
The phase where a new system is checked to ensure it is performing its intended functions is called the post-implementation review, which is essential for verifying system requirements and functionality.
Step-by-step explanation:
Checking to see if the new system is doing what it is supposed to do is part of post-implementation review. This phase occurs after the system has been implemented and is crucial for ensuring that the system meets the specified requirements and is functioning correctly.
Post-implementation reviews often include the testing of all aspects of the system, documenting any issues or defects, and verifying that the system meets the agreed-upon objectives.
The Post Implementation Review (PIR) is used to supply information about the outcomes and success of a project. The PIR lists the expected outcomes as specified in the Project Management Plan, reports on variances from that plan and then asks for recommendations and how they will be used, as well as lessons learned.
Therefore, the correct answer is C. post-implementation review.