The set of labels at which a user or role can work at any time is referred to as the account label range. The upper bound of the account label range is the account's clearance, and the lower bound is the account's minimum label. Users who are allowed only to work at a single label have a clearance that equals their minimum label. See "Accreditation Range Examples" for how the account clearance is selected from the total set of labels available to all users on the system.