Cloud Security Alliance (CSA) – Consensus Assessment Initiative Questionnaire (CAIQ)

An industry-accepted way to document what security controls exist in IaaS, PaaS, and SaaS services, providing security control transparency. It provides a set of Yes/No questions a cloud consumer and cloud auditor may wish to ask of a cloud provider to ascertain their compliance to the Cloud Controls Matrix (CCM).  

It helps cloud service providers and their customers to gauge the security posture and determine if their cloud services are suitably secure. In addition to improving the clarity and accuracy, it also supports better auditability of the CCM controls.

https://cloudsecurityalliance.org/artifacts/consensus-assessments-initiative-questionnaire-v3-1/