Compliance is not a popular concept for students in either grade school or high school. It's often in college that many students learn to juggle compliance and rebellion.
In the workplace, compliance is a great term, especially for engineers trying to link various electronic technologies together. That's why compliance testing by the ZigBee Alliance is a positive development. The wireless link could make it simple to put sensors and other parts in hard to reach areas, eliminating the physical challenges and reliability concerns associated with cables.
ZigBee's going to have to prove its reliability before it sees acceptance in the factory, and prices will have to come down a bit. But for the early adopters whose work will be watched closely, this compatibility testing is a strong positive development. It's tough enough to implement a new technology without worrying about whether there are going to be glitches in the basic communications between products from different manufacturers.
That's why compliance testing is a strong positive step as the technology moves into the marketplace. Because even with assured compatibility, integration in industrial environments is not child's play.