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This paper describes the architecture and requirements of an integrated system that is needed to support the command-and-control requirements of the Department of Homeland Security during crisis prevention, disaster relief, and other critical operations. The architecture is based on emerging science and technology that has been under development in information management. Lessons learned in the implementation of decision-support systems for Chemical, Biological, Radiological and Nuclear defense, standards, spiral-systems integration and implementation, and web-service-centric computing, contribute to the architecture's design. The theoretical underpinnings of such a system are represented using a formalistic approach called “paradigm reuse”.