FIGURE 6.1 Flow diagram showing how the four essential functions of the AON (large ovals) relate to each other and the broader stakeholders. The direct connection of AON functions to the stakeholders indicates that the AON builds on and enhances existing capabilities. The placement of network enhancement at the center of the diagram and its connectivity to all elements of the network shows how the AON plays a central role in tying together many existing components, strengthening ties among observation platforms, data centers, and users, and generally supporting and enhancing observing activities of all participants. Graphics by N. Hulbirt and B.G. Bays, Jr., University of Hawaii.