Who initiates system authorization process and has the full responsibility over the life cycle of an information system? Response:

A Security Control Assessor (SCA) conducts assessments, and a Risk Executive provides enterprise-wide risk management direction, but neither holds the primary lifecycle responsibility for a specific system.

The Information System Owner (ISO) is the individual with statutory, contractual, or operational responsibility for an information system, including its development, deployment, and disposal, and thus initiates and maintains overall responsibility for its authorization and lifecycle management.

The Authorizing Official (AO) makes the final decision to authorize or deny system operation but does not possess the full lifecycle responsibility for the system's management and operation.

The Information System Security Officer (ISSO) advises on and monitors the system's security posture but does not have the ultimate responsibility for the system's entire lifecycle.