Though born from the ashes of traditional hosting models, software as a service differs fundamentally from its predecessors. Its software is designed to be delivered as a service, security is better, rich user interfaces are available, and it has greater interactivity.
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how is it measured? What if capacity is allocated on a provisional basis (or as a standby for emergencies), and not used? How are users to be billed? Furthermore, most enterprise applications are used unpredictably, and composite or tightly integrated applications add further complexity. In the future, these applications will increasingly be made of dynamically linked components and services, and some will be used almost continuously, while others only occasionally. To measure such usage, one might