This report presents some of the data gathered in a survey of approximately 16,000 secondary school principals in the United States during the 1963-64 school year. Five different 125-item questionnaires were used in the survey, with approximately 3,200 principals answering each questionnaire. Altogether, 354 different questions were asked, 54 of which appeared on all five questionaires. Various questions examined the personal and professional background of principals; the duties, activities, and compensation of principals; and principals' attitudes on current educational issues. The data are displayed in 210 tables that list responses according to such factors as geographical region, school size, per-student expenditure, professional experience of the principal, rural or urban location, and public and private status of the school. Tables may reproduce poorly. (JG)