The successful implementation of IPS calls for the following components: the Textbook, the Teacher's Guide and Resource Book, and the Assessment Package. Access to a Macintosh* computer will greatly enhance value of the Assessment Package by providing a fast and thorough analysis of the multiple-choice questions through the Diagnostic Software. (See also From the Classroom). KaleidaGraph Student Edition is a powerful and user-friendly graphing application for both Macintosh* and Windows*, which does histograms the way IPS students are taught to do them in IPS. The Video cassette supplements several important reading sections of the Text.     About the Authors The IPS authors are an experienced team, each of whom brings important contributions from physics, chemistry, science teaching and science education to the development and implementation process. Uri Haber-Schaim, the project director and senior author since 1963, has a Ph.D. in physics from the University of Chicago. He has been active in research, a variety of curriculum development projects and teaching IPS institutes for many years. Reed Cutting retired after 38 years as a science teacher at Marblehead (MA) High School. He has been an active IPS teacher, workshop instructor and writer for more than 30 years. He has a B.A. from Wesleyan and an M.A. from Colgate University. H. Graden Kirksey, professor of chemistry at the University of Memphis, has a Ph.D. in physical chemistry from Auburn University and has been an IPS co-author and workshop instructor since 1970. Harold Pratt, formerly science coordinator in the Jefferson County (CO) Public Schools for 28 years, was on the original development team. He directed one of the first pilot centers and has supported the implementation of IPS since then. From 1991 to 1994 he was a member of the development team for the National Science Education Standards at the National Research Council. He has a B.A. from Phillips University and an M.A.T. from Brown University.