This article reports on the results of a study of tenure and promotion procedures at U.S. institutions where academic librarians are faculty. The author surveyed librarians from 200 institutions of higher education on promotion and tenure issues, and received 104 responses. Topics covered include: who performs reviews, whether organizations use library committees and/or university wide ones, how many external reviewers are used and what they are asked to review, and what documentation guides these processes. The results were compared for (1) institutional control (public/private), (2) small, medium, and large institutions, and (3) simplified basic Carnegie classification. The statistical results are presented.