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, and the examples are often British, although many of the suggested activities are adaptable to other countries. The materials are published in a set of eight Themes, where related materials are described. However, it is strongly recommended that a course should not be formed from the Themes in numerical sequence. The materials included have been selected on the basis of their "significance" for the pupils; that is, the "science studies should have immediate significance for the student in terms of its intrinsic interest, and at the same time, be concerned with the real adult world." There is an emphasis on pupil experimentation and on the social significance of scientific developments. The Teachers' Guide summarizes the content of the Themes; discusses the aims of science teaching, with particular reference to Secondary Science; describes techniques for using the books; suggests methods of introducing the work and organizing the laboratory; outlines 12 possible routes through the material, each providing an integrated science course; and provides a brief history of the project. The Themes are described in SE 015 441 to SE 015 448. (AL)