This chapter describes the relevant standards and the processes by which credentialing organizations may choose to be evaluated in relation to those standards. It focuses on external sources of evaluation and an emphasis on the psychometric aspects of a credentialing program— that is, a program intended for certification or licensure of individuals in a profession or occupation. Psychometricians who work with credentialing organizations may have a preference as to which standards apply best for the programs with which they work, but there is likely general agreement that the most authoritative and comprehensive standards to guide psychometric practice are those promulgated by the American Educational Research Association, the American Psychological Association, and the National Council on Measurement in Education (AERA, APA, & NCME). Most individuals involved with credentialing organizations realize that the examinations are not designed for purposes other than to issue a license or grant certification.