This study analyzed data from the Scholastic Aptitude Test (SAT) taken by high school seniors between 1975 and 1986. Its purpose was to study trends in the numbers, test scores, and other characteristics of examinees planning to major in mathematics, science, and engineering, and to compare these data with comparable data from examinees planning to major in other areas. The major findings included: (1) the number of examinees planning to major in mathematics, science, and engineering increased until 1983 and has since declined; (2) examinees planning to major in mathematics, science, and engineering in 1986 obtained SAT Verbal scores averaging 19 points higher than the average for all examinees, although the means varied greatly depending upon the specific major field choice; (3) the average SAT Mathematics scores of examinees planning to major in mathematics, science, and engineering in 1986 were 38 points higher than the average for all test takers; (4) examinees intending to study pre-medicine, classics, comparative literature, philosophy, classical languages, Chinese, Latin, Russian, education of the gifted and talented, and mathematics education had higher means than those interested in mathematics, science, and engineering; (5) the Verbal and Mathematics scores of examinees interested in computer science have declined 26 and 40 points respectively in the last ten years; (6) there are still more males than females interested in mathematics, science, and engineering; (7) women planning to major in electrical, mechanical, and civil engineering have higher average SAT Mathematics scores than the men interested in these fields; and (8) mean SAT Mathematics scores of blacks planning to major in mathematics, science, and engineering have risen considerably over the past decade, especially among those planning to major in mathematics or statistics. (TW)