Nuffield Secondary Science is a set of tested materials from which teachers can prepare courses for students in grades 9-11 (approximately) who do not intend to major in science. The materials are designed for British secondary schools but are adaptable to other countries. The Teachers' Guide to the entire set of Themes is described in SE 015 440 and the nature of each Theme summarized in SE 015 441. Theme 3 contains the following fields of study (with the subsidiary sections indicated in parentheses): Physical Activity (experience of physical activity, gaseous exchange, fuel, transport, heat production and temperature regulation, muscles and joints, growth and repair, water balance and wastes); Human Life Cycle: Reproduction, Growth and Development (conception to birth, childhood, physical development in adolescence, changes in behavior at adolescence, maturity and aging); Health and Hygiene (microorganisms and food, body's defenses, diseases); and Senses, Behavior, and Learning (the senses, perception, simple behavior--response to a stimulus, human behavior, motivation, attitudes, personality, substances influencing behavior). See also SE 015 442 to SE 015 448. (AL)