This review of research on class size is organized into two parts. Part 1 presents a summary list of true statements with respect to the central topic of this study. The statements are divided into three sections: (a) class size and pupil achievement, (b) class size and teaching procedures, and (c) teacher load. Some statements can be accepted as facts; others should be considered as contentions, not well supported by research or by any consensus in the literature. It is noted in part 1 whether the statement is being presented as a fact or contention; each statement is accompanied by references to part 2, where support for the statement can be found. Part 2 contains an analysis of the research on (a) terms and definitions in this area, (b) findings with respect to class size and pupil achievement, (c) studies of class size and teaching processes, (d) teacher load and its relationship to instruction, and (e) the law and contractual precedents on this issue in the state of Connecticut. (Author/JA)