What is primarily assessed in an ATO authorization package?

An ATO (Authorization to Operate) authorization package primarily assesses system security. This assessment is crucial as it verifies that the system meets the required security controls and compliance measures as outlined by various standards and directives, such as NIST SP 800-53. The goal is to ensure the system is protected against potential threats and vulnerabilities, thereby safeguarding sensitive information and maintaining the integrity of operations.

While aspects like system efficiency, user satisfaction, and cost-effectiveness are relevant in evaluating a system's overall performance and worth, they are not the primary focus of the ATO process. The essential requirement is to demonstrate that adequate security measures are in place to protect the system and its data from cyber threats, ensuring that it can operate safely within the organization's environment. This makes system security the central concern in an ATO authorization package.