This sourcebook provides direction for the elementary school teacher in working with Science Curriculum Improvement Study (SCIS) materials. It focuses on providing insight into the underlying rationale for these materials and on providing suggestions for the implementation of the program in the classroom. Part One provides a brief overview of the program and the materials. Part Two relates the program to (1) the current state of development of elementary school science, (2) the nature of science, (3) the psychology of learning, (4) approaches to teaching, and (5) school administration. Part Three discusses how the program relates to various conceptual areas of the scientific enterprise such as interaction, relativity, and systems. Part Four discusses the program's laboratory activities and contains numerous suggestions for implementing these activities in the classroom. Appended are suggestions to the teacher for the implementation of specific segments of the program, equipment lists, and a bibliography. (RS)