Who is responsible for reviewing ATO authorization packages and current audit documentation?

The correct answer is that the Validator is responsible for reviewing Authorization to Operate (ATO) authorization packages and current audit documentation. The Validator's role involves ensuring that all necessary documentation and evidence are provided and meet the established criteria. This includes verifying that the security controls are in place and functioning as intended, ultimately contributing to the risk management process before an ATO can be granted.

The Validator's responsibility directly impacts the security and operational posture of the organization by scrutinizing the compliance documentation and audit findings rigorously. In doing so, the Validator helps confirm that the organization adheres to all regulations and standards relevant to the authorization.

The roles of other individuals, such as the Authorizer, System Owner, and Auditor, differ slightly. The Authorizer typically makes the final decision on whether the system can be approved for operation based on the assessment results, rather than directly reviewing the documentation. The System Owner is primarily responsible for the overall management and governance of the information system but may not engage in the detailed review of ATO documentation. The Auditor assesses compliance from an independent perspective, often focusing on the post-implementation effectiveness of controls rather than the pre-authorization review process.