$90\mathrm{.}9\%$ complete

Question

A software specialist is preparing to integrate new software into the organization's network. To ensure the compatibility and performance of the software, the specialist first deploys it in a controlled environment. This process involves closely monitoring the software's functionality and checking for any compatibility issues or disruptions it might cause to the existing system. What concept is the specialist primarily utilizing to verify that the software operates as expected and is safe for implementation in the actual network?