CLASSIFICATION IS a way of making knowledge of the world more manageable. In fact, classification is so much a part of our lives that we are often unaware of its pervasiveness, and some writers suggest that the need to classify, label, and group things is an innate part of human nature.10

Arbitrary and intuitive classification systems that focus primarily on the classes have little value beyond a short-term, instrumental use for which they may be rapidly designed. A sound classification system is based on meticulous selection and definition of the classes and the attributes that distinguish them, ensuring that meaningful differences are recognized. You should express relationships between ...

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