SELECTED PAPERS FROM TWO 1964 CONFERENCES ON THE RELATIONSHIP OF COGNITIVE STUDIES AND CURRICULUM DEVELOPMENT ARE INCLUDED IN THIS JOURNAL. SUBJECTS CONSIDERED ARE (1) DEVELOPMENT AND LEARNING, (2) AMERICAN COGNITIVE STUDIES, (3) THE RELATIONSHIP BETWEEN COGNITIVE STRUCTURE AND EXPERIENCE, (4) THE USE OF LEARNING RESEARCH IN CURRICULUM DEVELOPMENT, (5) THE THEORETICAL IMPLICATIONS OF PIAGET'S THEORIES FOR CURRICULUM REVISION, (6) THE DEVELOPMENT AND ASSESSMENT OF COGNITIVE STRUCTURES, (7) THE RELATIONSHIP BETWEEN INTERNAL NECESSITY AND CONTRADICTION IN CHILDREN'S INTELLECTUAL DEVELOPMENT, (8) COGNITIVE DEVELOPMENT AND CONCEPT LEARNING, AND (9) THE ILLINOIS STUDIES IN INQUIRY TRAINING PROJECT. OTHER PAPERS ARE DEVOTED TO (1) A SCALE OF MENTAL DEVELOPMENT, AND (2) THE TRANSITION FROM CONCRETE TO ABSTRACT FUNCTIONING. A SERIES OF REPORTS ON CURRICULUM PROJECTS IN SCIENCE AND MATHEMATICS IS INCLUDED. SEVERAL PAPERS CONTAIN EXTENSIVE BIBLIOGRAPHIES. THIS DOCUMENT IS AVAILABLE AS THE "JOURNAL OF RESEARCH IN SCIENCE TEACHING," VOLUME 2, ISSUE 3, SEPTEMBER 1964 FOR $3.00 FROM JOHN WILEY AND SONS, 605 THIRD AVENUE, NEW YORK, NEW YORK 10016. (AG)