This article first provides an introduction to and summary of Principles of Accreditation accompanied by a detailed list of provisions specifically applicable to libraries in higher education. The provisions and importance of Standards for College Libraries, approved by the Association of College and Research Libraries (ACRL) in 2000, are summarized and examples of implementation are identified. In a 2003 revision, minimal changes were made to these ACRL standards, which received final approval as the ACRL Standards for Libraries in Higher Education in June 2004. These standards now supercede the three ACRL type-of-library standards produced separately for universities, colleges, and community and junior colleges. All institutions accredited by a regional accreditation agency or professional groups that expect outcomes assessment will gain valuable information and suggestions by reviewing these ACRL standards.