Which role has the supporting responsibility to coordinate changes to the system, assess the security impact and update the system security plan? Response:

The Information System Security Officer (ISSO) is a key role responsible for ensuring the security of an information system. Their duties often include reviewing proposed changes for security implications, coordinating implementation, and ensuring that security documentation, such as the System Security Plan, remains accurate and up-to-date with the system's current configuration and operational state.

The Information System Owner (ISO) is responsible for the overall procurement, development, integration, and operation of an information system, including its security, but the ISSO often handles the day-to-day security coordination and impact assessment details.

A Common Control Provider is responsible for developing, implementing, assessing, and monitoring common controls that are inherited by multiple systems, not specifically for system-specific changes and SSP updates.

The Senior Agency Information Security Officer (SAISO), also known as CISO, has agency-wide responsibilities for the information security program, a higher-level strategic role rather than hands-on coordination of system-level changes.