Documenting the description of the system in the system security plan is the primary responsibility of which Risk Management Framework (RMF) role? Response:

The Authorizing Official (AO) is responsible for making the final authorization decision for the system, not for the primary documentation of the system description.

While the Information Owner (or Data Owner) is responsible for the data within the system, the Information System Owner is explicitly responsible for the system itself and its documentation.

The Information System Security Officer (ISSO) is responsible for maintaining the security posture of the system, advising the System Owner, and implementing security controls, but the primary documentation responsibility lies with the System Owner.

The Information System Owner has the primary responsibility for the development, documentation, operation, and maintenance of an information system throughout its lifecycle. This specifically includes providing a detailed description of the system within the System Security Plan (SSP) as part of the RMF's Prepare and Categorize steps.