Hypotheses explaining the Scholastic Aptitude Test (SAT) score decline have been advanced in letters to the College Entrance Examination Board and to the Advisory Panel on the Scholastic Aptitude Test Score Decline, in magazine articles, and in newspaper stories. A list of these hypotheses are presented and categorized according to changes in the schools, changes in society, changes in the population, and problems with the tests. The first major category (changes in the schools) is further broken down into hypotheses related to curriculum, institutional policies, teachers, and students. The second major category (changes in society) lists hypotheses related to family, religion, civil rights, crisis of values, national priorities, economic, labor movement in education, and technological changes. (Author/EVH)