THIS MANUAL IS DESIGNED FOR STUDENTS IN UPPER ELEMENTARY GRADES STUDYING THE SCIENCE CURRICULUM IMPROVEMENT STUDY (SCIS) UNIT "POSITION AND MOTION". THE OVERALL STRUCTURE OF THE UNIT FOLLOWS A CYCLE OF PRELIMINARY EXPLORATION, INVENTION OF SPECIFIC CONCEPTS RELATED TO REFERENCE FRAMES, AND DISCOVERY OF THE USEFULNESS OF THE CONCEPT. PARTICULAR ATTENTION IS GIVEN TO CHILDREN'S SKILL IN DESCRIBING POSITION AND MOTION. THE UNIT IS DIVIDED INTO FIVE PARTS WHICH ARE (1) POLAR COORDINATES, (2) REFERENCE DIRECTIONS, (3) RECTANGULAR COORDINATES, (4) OBJECTS IN MOTION, AND (5) COLLISION EXPERIMENTS. EACH PART IS DIVIDED INTO SEVERAL CHAPTERS. EXTENSIVE USE IS MADE OF PHOTOGRAPHS, GRAPHS, DIAGRAMS, AND DRAWINGS IN THE DEVELOPMENT OF CONCEPTS. THIS DOCUMENT IS AVAILABLE FROM THE SCIENCE CURRICULUM IMPROVEMENT STUDY, UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720. (DS)