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 for other countries. The Teachers' Guide to the entire set of materials is described in SE 015 440 and the nature of the Themes summarized in SE 015 441. Theme 7 contains the following fields of study (with subsidiary sections indicated in parentheses): Collecting and Classifying Materials (classification, investigating the structure of matter); Metals and Alloys (metals and their sources, effects of heat on metals, etc.); Fuels (burning some materials, origin and manufacture of fuels, igniting fuels, etc.); Synthetic and Natural Products (types of building materials, strength and hardness, porosity of building materials, environmental effects on materials, soaps and detergents, other cleaning agents, emulsions); and Radioactive Materials (introduction to radioactivity, radiation and ionization, hazards and protection, radioactive decay, uses, biological effects). See also SE 015 442 to SE 015 448. (AL)