The Agency ATO Process: What Changes Between FedRAMP Authorization and System Deployment

FedRAMP authorization (either Agency ATO or JAB P-ATO) authorizes a cloud service offering at a baseline level. When an individual federal agency deploys that authorized service, they must issue their own Authority to Operate, which requires agency-specific control implementation documentation, an Interconnection Security Agreement (ISA) if the system connects to existing agency infrastructure, a Privacy Impact Assessment (PIA) under the E-Government Act, and a System Security Plan (SSP) that incorporates the CSP's FedRAMP SSP as a baseline but adds agency-specific configurations. The engineering work required to support an agency ATO — responding to agency-specific control questions, documenting deviations, and implementing agency-mandated configuration changes — is consistently underestimated by vendors who assume FedRAMP authorization is sufficient.

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