THE SETS OF INSTRUCTIONAL MATERIALS PRESENTED IN THIS VOLUME WERE DESIGNED TO CALL INTO THE LEARNING SITUATION THE MOST HIGHLY DEVELOPED COGNITIVE APTITUDES OF INDIVIDUAL STUDENTS. THE ASSUMPTION BEHIND THEIR DESIGN WAS THAT LEARNING DIFFICULTIES IN VARIOUS SUBJECT-MATTER AREAS COULD BE MINIMIZED BY ALTERING THE CONTENT OF TEXTUAL MATERIAL TO FIT THE INDIVIDUAL'S APTITUDE PATTERN. FOUR SETS OF DATA ARE INCLUDED--(1) MATERIALS FOR REDUNDANCY STUDIES (REDUNDANCY IN TEXTUAL MATERIAL), (2) LEARNING MATERIALS AND TESTS FOR STUDIES OF ELEMENTARY SET CONCEPTS, (3) MATERIALS AND TESTS FOR VOCABULARY LEARNING STUDIES, AND (4) LEARNING MATERIALS FOR MATHEMATICAL OPERATIONS STUDIES. RELATED INFORMATION MAY BE FOUND IN ED 010 627. (JH)