A. Comprehensive level (81%-100%)
A collection in which a library endeavors, as far as is reasonably possible, to include all significant works of recorded knowledge for a necessarily defined field. This level of collecting intensity is that which maintains a "special collection;" the aim, if not the achievement, is exhaustiveness.
B. Research level (61%-80%)
A collection which includes the major publication source materials requires for dissertations and independent research, including materials containing research reporting, new findings, scientific experimental results, and other information useful to researchers. It also includes all important reference works and a wide selection of specialized monographs, as well as an extensive collection of journals and major indexing and abstracting services in the field.
C. Study level (41%-60%)
A collection which supports undergraduate or graduate course work, or sustained independent study; that is, which is adequate to maintain knowledge of a subject required for limited or generalized purposes, of less than research intensity. It includes a wide range of basic monographs, complete collections of the works of important writers, selections form the works of secondary writers, a selection of representative journals, and the reference tools and fundamental bibliographical apparatus pertaining to the subject.
D. Basic level (21%-40%)
A highly selective collection which serves to introduce and define the subject and to indicate the varieties of information available elsewhere. It includes major dictionaries and encyclopedias, selected editions of important works, historical survey, important bibliographies, and a few major periodicals in the field.
E. Minimal level (1%-20%)
A subject area in which few selections are made beyond very basic works.
O. Not collected.