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Hands-on training and operation is generally considered the primary means that a user of a complex system will use to build a mental model of how that system works. However, accidents abound where a major contributing factor was user disorientation/misorientation with respect to the automation behavior, even when the operator was a seasoned user. This paper presents a compact graphical method that can be used to describe system operation, where the system may be composed of interacting automation and/or human entities. The fundamental goal of the model is to capture and present critical interactive aspects of a complex system in an integrated, intuitive fashion. This graphical approach is applied to an actual military helicopter system, using the onboard hydraulic leak detection/isolation system as a testbed.