This manuscript, prepared by Doctor Koos and the staff, is a summary of the entire survey as published in 27 other monographs. It epitomizes the organization of secondary education, giving due stress to full-time and part-time schools; to the nature of the secondary-school population, showing that it has increased very greatly and, therefore, it has more variety than formerly; to the resulting reorganized forms of secondary education, particularly the junior high school, the 6-year school, and the junior college. This monograph contains the following chapters: (1) Some highlights in the findings of the survey; (2) Using the reports and findings of the survey; (3) Making the survey; (4) The Horizontal organization of secondary education; (5) The Secondary-school population; (6) The Vertical reorganization of secondary education; (7) The smaller secondary schools; (8) Secondary education for Negroes; (9) District organization and secondary education; (10) Legal and regulatory control of secondary education; (11) Trends in the articulation of high school and college; (12) Administrative and supervisory staffs and programs of supervision; (13) Selection and appointment of teachers; (14) Provisions for individual differences; (15) Programs of guidance; (16) Research within schools and systems; (17) Interpreting the secondary school to the public; (18) The secondary school library; (19) Procedures in curriculum making; (20) Trends in programs of studies; (21) Instruction in certain subject groups; (22) Nonathletic extracurriculum activities; (23) Intramural and interscholastic athletics; and (24) Health work and physical education. Individual chapters contain footnotes. (Contains 7 figures and 2 tables.) [Best copy available has been provided.]