The information contained in this report was drawn from data provided by a national sample of 200 Catholic high schools. The schools were selected to reflect types (private, Catholic, diocesan, and parish schools), enrollment sizes, and geographic location. The report addresses these areas. First, information is provided to point out the financial significance of Catholic high schools and their contribution to American education. Second, since many Catholic schools do not have a long tradition of professional accounting and financial management, some principles and guidelines are presented to help some of today's administrators. Finally, financial figures for illustrative models or "average schools" are provided for use as measures against which to compare individual schools. These average school operating statements are computed to provide examples for various enrollment sizes and school types. The information used in constructing the model covers such areas as expenses; revenues; and enrollment, professional staffs, average salary for religious teachers, average lay salaries, and average contributed services. A list of the schools supplying information is included along with the questionnaire used to gather the data. (Author/IRT)