Cross-domain interoperability exists when organizations or systems from different domains interact in information exchange, services, and/or goods to achieve their own or common goals. Interoperability is the method of systems working together (inter-operate). A domain in this instance is a community with its related infrastructure, bound by common purpose and interests, with consistent mutual interactions or rules of engagement that is separable from other communities by social, technical, linguistic, professional, legal or sovereignty related boundaries. Cross-domain interoperability exists when organizations or systems from different domains interact in information exchange, services, and/or goods to achieve their own or common goals. Interoperability is the method of systems working together (inter-operate). A domain in this instance is a community with its related infrastructure, bound by common purpose and interests, with consistent mutual interactions or rules of engagement that is separable from other communities by social, technical, linguistic, professional, legal or sovereignty related boundaries.