This volume, part of the Junior High School Transition Study which examined students' adjustment to junior high school, reports on findings related to instructional organization in elementary and junior high schools. Chapter 1 presents a brief overview of the project and outlines the theoretical framework used to describe and compare the ways in which instruction was organized in the sixth and seventh grade classrooms that were observed. It also includes a brief description of the way in which the organizational data were collected. Chapter 2 summarizes the findings regarding organization of instruction in 13 sixth grade classrooms that fed into Waverly Junior High School and 14 seventh grade classrooms at Waverly. Chapter 3 describes the particular organization of each of the sixth grade classrooms involved in the study; chapter 4 does the same for the seventh grade classrooms. Chapter 5 presents a brief description of the transition study teacher samples and the methodology used to collect data. This volume includes 39 tables and a bibliography. (JM)