Authorization to Operate
An Authorization to Operate (ATO) is a formal declaration by a Designated Approving Authority (DAA) that authorizes operation of a Business Product and explicitly accepts the risk to agency operations. The official management decision given by a senior organizational official to authorize operation of an information system and to explicitly accept the risk to organizational operations (including mission, functions, image, or reputation), organizational assets, individuals, other organizations, and the Nation based on the implementation of an agreed-upon set of security controls.