The 1966-68 Stanford mathematics programs in computer-assisted instruction (CAI) is reported in this book. The first part describes in detail the 1966-68 arithmetic drill and practice program which followed the similar program run in 1965-66. Part II describes the tutorial program in first and second grade mathematics at Brentwood School in East Palo Alto. Each of the two parts emphasizes three main aspects of the program: the curriculum, the operation of terminals in schools, and the behavioral analysis of student response data. An introductory chapter considers some of the issues raised by CAI and overviews the operation during 1966-68. Sections in the first part describe the curriculum and students, regression models and response data, automation models of student performance, and data on learning and evaluation. Sections in the second part cover the Stanford-Brentwood laboratory and program, the curriculum and operation of the laboratory, analysis of response data, and analysis of individual student data. Appended are more detailed supplementary materials. (SH)