Security control frameworks (e.g., ISO/IEC 27001, NIST SP 800-53, CSA Cloud Controls Matrix) provide a structured and standardized approach to assess the security posture of cloud providers. These frameworks ensure completeness and alignment with best practices. "Standardized security frameworks enable consistent evaluation of third-party providers and alignment with industry-recognized security requirements." - CISM Review Manual 15th Edition, Chapter 3: Third-Party Risk Management* Penetration test results and SLAs are useful, but only frameworks provide comprehensive coverage.