High Quality Content by WIKIPEDIA articles! Precision engineering is a subdiscipline of electrical engineering, electronics engineering, mechanical engineering, and optical engineering concerned with designing machines, fixtures, and other structures that have exceptionally low tolerances, are repeatable, and are stable over time. These approaches have applications in machine tools, MEMS, NEMS, optoelectronics design, and many other fields. A fundamental principle in precision engineering is that of determinism. System behavior is fully predictable even to nanometer-scale motions. "The basic idea is that machine tools obey cause and effect relationships that are within our ability to understand and control and that there is nothing random or probabilistic about their behavior. Everything happens for a reason and the list of reasons is small enough to manage." "By this we mean that machine tool errors obey cause-and-effect relationships, and do not vary randomly for no reason.

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