If you are integrating a test system, you will need to communicate between the test system controller and the instruments. The days where GP-IB was the default choice are long gone, and five new standards now reign. For traditional instruments, GP-IB has been largely replaced by LAN, based on the LXI protocols. The strongest growth has come from modular instruments driven by PXI, but also consisting of VXI and AXIe. And you are likely to use software drivers managed by the IVI Foundation.
I review what is new LXI, PXI, VXI, AXIe, and IVI here.