Abstract
The necessity of knowledge of structure of a classification not only to compilers of systems but also to those who classify documents or search is emphasized. American and European assumptions are contrasted. The relationship of a special classification to a general classification is considered. Some differences in the construction of three general schemes are noted. The concept of a "main class" is elucidated. Alternative starting points for dividing knowledge by its forms or by phenomena are exemplified. The idea that the treatment of main classes rcflects a world view is offered and supported by illustrations. Principles for determining degree of detail are presented. The case for specificity is argued. Procedures for making a science class are contrasted with those for making a humanities class.
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