Final answer:
The capacity for emergency management and response personnel to interact and work well together describes the principle of Interoperability, which is essential for effective coordination during emergencies.
Step-by-step explanation:
The 'capacity for emergency management and response personnel to interact and work well together' describes the principle of Interoperability within the key communications and information systems principles. Interoperability refers to the ability of different systems, agencies, and organizations to work together effectively in times of crisis, ensuring a coordinated and efficient response. It involves harmonizing equipment, communications, data management, and operational procedures across various entities to achieve this goal. Without interoperability, emergency responses can be fragmented and less effective, putting lives and property at greater risk.