This report summarizes the findings of the Junior High School Transition Study. Section 1 describes the data base used in all three phases of the study. Section 2, "Organization of Instruction," discusses the instructional organization in grades six and seven and the implications for successful student performance in junior high/middle school. In the third section, students' concerns and feelings about their school experience are described. This section contains the results of the Student Opinion Survey, and of the Concerns Questionnaire, a comparison of certain key results of each instrument, and implications for improving the transition process and teaching practices. "Students' Response to Junior High School," section 4, discusses findings regarding students' success in transition, changes in student participation, success of students in general, and implications for improving junior high/middle schools. Section 5, "Students' Conceptions of Teachers and Classroom Experience," includes teacher descriptions, profiles of teacher types, and implications for improving instruction. "Parents' Concerns," section 6, discusses concerns that were reported, criteria for successful transition, and implications. A summary, references, and 6 tables are also included. (JM)