Responses to an extensive survey by 910 (62 percent) of the head administrators at the 1,464 Catholic high schools in the United States provide the information presented in this report. The survey, containing 1,063 pieces of information in 14 sections, was designed to create a view of the resources, programs, facilities, personnel, and policies of Catholic high schools. Special scrutiny is given to how Catholic schools vary by gender composition (coed versus single sex), size, governance (parochial, interparochial, private, diocesan), and percentage of students from low-income families. Chapters 2-12 give a composite view of Catholic high schools, with each chapter focusing on a particular aspect of school life. Chapters 13-15 look at how school characteristics vary as a function of percentage of low-income students, gender composition, and operating authority. Chapters 1 and 16 are more thematic and interpretive. The appendixes contain the following additional information: (1) a list of consultants; (2) the survey instrument, instructions, and national summary data based on all 910 school reports; (3) a list of Catholic high schools that report having made significant achievements in each of nine categories; and (4) a list of project publications and procedures for obtaining additional data information. (MLF)