Data analyses and interpretation are presented in this report on data obtained from "A Study of Schooling." For this study, data were collected from elementary, junior, and senior high schools (a total of 38 schools) through the use of classroom observation, questionnaires, and interviews. The data discussed in this report is concerned with educational structures, processes, and attitudes, and is presented in four sections. Section I considers instructional practices, teachers' and students' activities, and student perceptions of selected instructional practices. Classroom structures are examined in Section II, including data on teacher student ratios, classroom space and furnishings, student cooperative and independent learning, grouping practices, and individualization of instruction. Section III summarizes results of classroom observations of the use of time by students and teachers, decision making practices, and controls and restraints used by teachers. The data on classroom learning environment is explored in Section IV. Data on this topic was obtained from students' responses to survey questions and observers' judgments about the affective time of teacher student interactions. A profile of teacher student and student peer relationships emerged. (JD)