Large, complex ATE systems are often run by large, complex software systems. The complexity of the software is inevitably a result of the complexity of the system, which is a direct result of the problem solved by the system.
Fortunately, test engineers are really smart people. As such, they have no problem dealing with the complexity of the measurement problem. In fact, the test engineer sees more complexity in the measurement problem than does someone unfamiliar with the details. Because they understand the problem better than anyone else, the test engineer is the best person to figure out exactly what test to run, and exactly how to run it.
Unfortunately, the large, complex software systems that run large complex ...