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. The Teachers' Guide to the entire set of Themes is described in SE 015 440. Each Theme is a teachers' guide to a particular set of activities and is not intended for student use. There are no student textbooks prepared by the project. Teachers are helped to structure activities so that as far as possible the "pupils make discoveries which are genuine to themselves." For each section, descriptions of appropriate experiments, possible teaching strategies, examples of discussion and consolidation questions, and lists of necessary apparatus are given. References for each field of study include books, pamphlets, and audio-visual aids. The following fields of study (with subsidiary sections indicated in parentheses) are included in Theme 1: Environmental Studies, Classification, and Identification (aquatic habitats, non-aquatic habitat, field work in built-up areas, soil); Basic Exchanges (water, carbon and oxygen, energy, nitrogen); Animal and Plant Growth: Population Studies (growth experiments, population and community); and Colonization: Disease, Pest, and Weed Control. See also SE 015 440 to SE 015 448. (AL)