According to the NIST glossary, a system owner is a person or organization having responsibility for the development, procurement, integration, modification, operation, and maintenance, and/or final disposition of an information system.

According to the NIST glossary, an information owner is an official with statutory or operational authority for specified information and responsibility for establishing the controls for its generation, collection, processing, dissemination, and disposal.

According to the NIST glossary, an SSO is an individual with assigned responsibility for maintaining the appropriate operational security posture for an information system or program.