The editors of this review have focused on four purposes: (1) to portray the state of knowledge in science education, (2) to describe any existing trends, (3) to identify areas which need to be researched, and (4) to provide tentative answers to pertinent problems, if any seem to emerge from the research. Research studies reviewed have been divided into the main categories of learning; education, characteristics and behaviors of teachers; values and philosophy; and surveys. Also, an index and bibliography are provided in order that the reader may make easy reference to the 307 research studies listed. (CP)