Book excerpt: This volume is intended to be used by practicing scholars as well as students. It represents all major and some of the minor trends that have evolved during the past decade. Book titles from all available sources have been included, as well as periodical articles from the major journals, whenever there was evidence of a theoretical approach. To ensure maximum accessibility of the entries listed, books and articles in language other than English and unpublished dissertations and working papers have been excluded. All entries are fully annotated and the volume is completed by indices of authors and subjects.