Mechanics of microelectrics examined by design of experiments techniques

We live in a world full of variations. We need to understand its sources and we need a scientific method for predicting it, for reducing it and for controlling it. Statistical thinking is the only way to deal with variations. Continuous improvement means continuously solving the variation problem. But this relies on a successful marriage of theory and practice; experience is insufficient without theory. The theory needs to be taught. There is no substitute for knowledge (Logothetis, 1991).