The past decade has seen a revolution in the way we communicate. An increasing number of services are going – or are being created – online, along with vast quantities of rich, multimedia content. The Digital Society that derived from this revolution is accompanied by a change in expectations. All participants – consumers, service providers, government – will expect the underlying communications infrastructure to support the demands the Digital Society will place on it. They will expect services to provide the required functionality, to be available at all times and in all places and to process and store data securely. Moreover, the service and infrastructure components will need to actively cooperate to provide the most reliable environment where services become increasingly complex, interdependent and mashed-up. It is the subject of availability that concerns us here – research into the technologies that improve the resilience of data networks and, therefore, the availability of online services.

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