# Alliance Interoperability ## Definition Alliance interoperability is the ability of separate national organizations to exchange information, coordinate action and use compatible procedures or systems without becoming one institution. ## Architecture Interoperability may require shared technical standards, classification equivalence, identity and access controls, handling rules, secure transport, common vocabularies and agreed authority boundaries. [[wiki/Intelligence Liaison|Intelligence Liaison]] is its intelligence-specific institutional form. [[wiki/Five Eyes|Five Eyes]] is a durable example of interoperability becoming embedded through practice and infrastructure.