The College Entrance Examination Board is concerned about the possible effects of coaching at some schools on Scholastic Aptitude Test scores. For this study, being carried on by Henry Dyer, two relatively similar preparatory schools, Exeter and Andover, were chosen, Exeter as the experimental group, Andover as the control group. In October 1951, an old form of the SAT WSA2, was administered to seniors at both schools. During the winter the seniors at Exeter underwent a course of coaching for speed in arithmetical operations, for mathematical reasoning, for vocabulary, and for reading comprehension of the type used in the test. The seniors at Andover underwent no such course. In March 1952 all seniors at both schools took the current SAT, ASA2.