This book is a manual for the administration and interpretation of the Learning Styles Inventory, Version III (LSI-III). Part 1 is reproducible (so each teacher who administers the LSI can have a copy) and answers the following concerns: what the LSI-III is and what it measures; administering and scoring the LSI-III; interpreting students' scores on the LSI-III; and altering teaching styles to accommodate students' learning styles. Part 2 reports the research that established the technical qualities of this revised edition of the LSI and includes sections that describe the content validity, construct validity, and reliability. Appendix A describes the theoretical rationale and underlying research that supports the usefulness of information about student learning styles and reviews the major theoretical perspectives on human abilities, interests, and styles. Appendix B describes other instruments that can help educators evaluate student abilities, interests, and learning and expression styles. Appendix C provides sample pages from some of these other instruments. Finally, Appendix D includes samples of both the elementary and middle school versions of the LSI-III as well as the teacher edition. (Contains approximately 110 references.) (DB)