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The 'Operations Concept for the AAS Man-Machine Interface' documents a concept for ACF operations, the tasks of the Controller at various types of sectors, his information processing requirements, and the definition of his dialogue with the system. As such, these represent the operational requirements for the Advanced Automation System (AAS) Controller man-machine interface (MMI). These requirements are defined from the Controller's point of view. Controller tasks are described in terms of message inputs, outputs, dialogue requirements, and operational performance attributes. An assessmment of Controller workload is provided within the framework of human information-processing tasks and associated performance levels by Controller position. The information-processing tasks are considered to include logical (cognitive and perceptual components. These components will of necessity have an impact on the subsequent formation of information coding/presentation requirements, interaction techniques, and high- level dialogue descriptions. The primary objective of this document is to decompose Controller tasks to the level of detail such that the Controller's job is described in terms of: (1) sequences of tasks which respond to a given ATC event; (2) the conceptual dialogue between the Controller and his workstation; (3) interactions with other Controllers, Pilots, Supervisory, and Metering/Flow Control personnel; and (4) information needed by the Controller to successfully execute tasks accurately and in a timely fashion.