Which standards body depends heavily on contributions and input from its open membership base?

NIST (National Institute of Standards and Technology) is a U.S. government agency that publishes standards and guidelines, often with public comment periods, but it is not membership-driven in the same way.

ISO (International Organization for Standardization) is a non-governmental organization that develops international standards through a more formal, consensus-based process involving national standards bodies.

ICANN (Internet Corporation for Assigned Names and Numbers) coordinates the internet's unique identifiers, operating with a multi-stakeholder model but not primarily as an open-membership body contributing security standards in the same context.

The Cloud Security Alliance (CSA) is a not-for-profit organization that actively promotes research, education, and best practices for securing cloud computing. It depends significantly on its global, open membership base to contribute expertise, create frameworks, and advance cloud security knowledge.