1. Tests to determine whether an implemented system fulfills its requirements. 2. The checking of data for correctness or for compliance with applicable standards, rules, and conventions. 3. [The] process of applying specialized security test and evaluation procedures, tools, and equipment needed to establish acceptance for joint usage of an information system (IS) by one or more departments or agencies and their contractors. [INFOSEC-99] Note: This action will include, as necessary, final development, evaluation, and testing, preparatory to acceptance by senior security test and evaluation staff specialists. [NIS] 4. In universal personal telecommunications, the process of verifying that a user or terminal is authorized to access UPT services.5. The checking of a representation of a system or part of a system for conformance with its requirements [CESG].6.The process of evaluating a ported application, software, or system to ensure compliance with requirements [POSIX.0].