Institutional research (IR) offices on campus are not all alike, any more than campuses are all alike. They may differ in their reporting line, range of responsibilities, level in the campus hierarchy, and work emphasis. Institutions differ in complexity (number and level of programs, colleges, and schools), size of the student body, affiliation, and other characteristics. All these factors have an impact on the external reporting required of the IR office. The majority of external reports involving IR concern admissions and enrollment data as well as some faculty and staff and finance information. This article describes the various external reporting responsibilities of IR offices.