Building a test system without a plan for how you will connect your instrumentation to your device under test (DUT) is similar to trying to drive your car without wheels. Your car may have best-in-class horsepower, but you aren’t going to reach your destination without wheels. Mass interconnects and test fixtures are where the rubber meets the road for automated test systems. After determining your instrumentation, the number of switches you need, and the location that your switches will reside in the test system, the next step is to choose a suitable mass interconnect system and design an appropriate fixture that seamlessly connects your DUTs to the rest of the system.