Book Reviews JOHN B. HANEY, Editor A Long-Awaited Volume A Major Treatise on Aptitude-Treatment Interaction Research Aptitudes and Instructional Methods, by Lee J. Cronbach and Richard E. Snow. New York: Irvington Press, Inc., 1977. 604 pages. $35.00. Reviewed by Richard E. Clark For educational communications and technology this book may turn out to be the most important work on research published in the past 20 years. It is an outstandingly successful effort to combine the re- search on individual differences being conducted by educational psychologists with the research on "treatments" (instructional methods) which is the specialty of educational technologists. The marriage (called aptitude-treatment interaction [ATI] research) promises to be difficult but happy for both partners. Quite a few people have waited many years for this book to ap- pear. Research for it was begun in 1967 and the writing was carried out over a period of at t~st five years. A hint of its contents was presented m an often oted technical monograph pubhshed by the authors through the Stanford University School of Education. 1 of a rough draft of 'thelfirst few chapters were circulated in Copies 'Cronbach, L.J., & Snow, R.E. Individual differences in learning ability as a function of instructional variables. Final Report, U.S. Office of Education, Con- tract No. OEC 4-6-061269-1217, School of Education, Stanford University, March 1969. Richard E. Clark is associate professor of education and chairman, Area of Instruc- tional Technology, Syracus~e University, Syracuse, New York. AVCR VOL. 24, NO. 4, WINTER 1976 437