Final answer:
System conversion is the term used to refer to the activity of installing a new system after it has passed testing during the system implementation phase of the SDLC.
Step-by-step explanation:
During the system implementation phase of the systems development life cycle (SDLC), the activity referred to when an organization installs the new system, after it has passed testing, is known as system conversion. This step involves transitioning from the old system to the new one and may be done in various ways such as parallel, direct, phased, or pilot conversion strategies.
The process of system implementation includes not only the initial installation but also the refinement of the system based on testing and evaluation. It may involve several iterations, as the system is fine-tuned to meet organizational requirements and to address any issues that arise during testing.
The goal of system conversion is to ensure the new system is fully functional and integrated into the daily operations of the organization, effectively replacing or enhancing the previous system.