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In project management, particularly in network diagrams, "activity on node" (AON) and "activity on arrow" (AOA) represent different methods for illustrating project tasks. In AON, nodes represent activities, and the arrows indicate the relationships or dependencies between them, allowing for easier identification of slack time directly related to each activity. Conversely, in AOA, the arrows represent activities, and nodes represent events, which can complicate the identification of slack as it is associated with the events rather than the individual activities. As a result, slack management can be more straightforward in AON compared to AOA.

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