The introductory sections of this volume present the basic rationale and principles involved in the development of the classification system for ecological diversity. The text describes the relevance of diversity classification to identification, inventory, habitat, and site-species relationships. Explanations of the classification and information systems and their application to inventory, analysis, and characterization of diversity form the core of the book. Originally published in 1981. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.