Which aspect does the third tier of risk management in NIST SP 800-39 address?

The third tier of risk management in NIST SP 800-39 specifically addresses Information Systems. This tier focuses on the implementation of risk management practices at the level of specific information systems that support the organization’s missions and business processes. It examines how risks associated with these systems are assessed and managed, ensuring that the security controls and measures in place align with the overall risk strategy of the organization. By concentrating on Information Systems, organizations can effectively identify vulnerabilities and mitigate risks that could impact their operations and sensitive information.

In contrast, the other tiers are centered on broader organizational concepts. The first tier deals with organizational policies and structures, crucial for establishing the foundation of risk management practices across the organization. The second tier focuses on mission and business processes, ensuring that risk management aligns with the organization's goals and operational objectives. Regulatory compliance encompasses external requirements that organizations must adhere to but is not the primary focus of this specific tier.