An individual’s right to a certain claim, for example, as to education. Usually a credential is supported by an official document: the physician’s medical school diploma, state license, and specialty certification certificate are examples. Credentials, once attained, tend to be fixed, al¬ though in some instances they expire, and renewal or recertification may be required. In other instances, credentials may be withdrawn by the issuing body. And, of course, the individual may acquire additional credentials.