The document describes an air traffic control system. It includes descriptions of various components like flight plan processing, supervisory control, simulator, radar data processing, and intranet connections. Diagrams show how these components interact and interface. The document also discusses concepts like system complexity, code size, abstraction levels, and how changes can impact complexity over time. Design patterns for modeling points in multiple dimensions are presented, with interfaces to support additional types. State diagrams demonstrate modeling state machines with states, transitions, and tasks.

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