Proposed Audit/Authorization Plan propose the audit process to be employed by as a means of issuing an ATO, and just in case also provide a basis for issuance of an IATO

This whole thing is about compliance you are installing a mandated solution based on a known standard there are no surprises the controls are already mandated... the assumption is that if the control is properly deployed then the security is a given this is confirmed by third party audit (the feds) this is a sub-plan that you put into your plan that guarantees the confirmation/authorization process how will this be audited by who when outcomes (who gets the report and what the potential outcome options are) control the outcome of the compliance process by stipulating what/how youll be evaluated