Security Control Assessor (SCA)
A Security Control Assessor (SCA) is an independent evaluator who tests and verifies whether security controls are properly implemented and effective. The SCA conducts the formal assessment that the Authorizing Official relies on to make the ATO decision.
The SCA reviews documentation, interviews system administrators, and tests security controls to produce a Security Assessment Report (SAR). Their independence is important — they should not be the same people who implemented the controls, ensuring an objective evaluation.
Why It Matters
The SCA's findings directly influence your ATO decision. Preparing thorough evidence packages and ensuring your team can explain how controls work during interviews makes the assessment process smoother and faster.