In this chapter, the authors present a formal model of the Anesthesia Unit and Surgical Wards (UAPQ) of a Chilean hospital. The objective was to document and to understand its operation, to assist hospital management and to facilitate its simula - tion. The model was built with Specification and Description Language (SDL). This methodology was used because it allows the design of a model that represents the system in a graphical, modular, and standard way. Our design contains the follow - ing agents: the system, 11 blocks, and 52 processes. The blocks and the processes describe the clinical and administrative activities. The environment of the UAPQ model contains 3 components: clinical services, emergency units, and support units.

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