Bob Snowdon

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Autonomic systems manage themselves given high-level objectives by their administrators. They utilise feedback from their own execution and their environment to self-adapt in order to satisfy their goals. An important consideration for such systems is a structure which is conducive to self-management. This paper presents a structuring methodology for(More)
Software that cannot evolve is condemned to atrophy: it cannot accommodate the constant revision and re-negotiation of its business goals nor intercept the potential of new technology. To accommodate change in software systems we have defined an active software architecture to be: dynamic in that the structure and cardinal-ity of the components and(More)
Long-lived, architecture-based software systems are increasingly important. Effective process support for these systems depends upon recognising their compositional nature and the active role of their architecture in guiding evolutionary development. Current process approaches have difficulty with run-time architecture changes that are not known a priori,(More)
Commercial off-the-shelf (COTS) software products are increasingly used as standard components within integrated information systems. This creates challenges since both their developers and source code are not usually available, and the ongoing development of COTS cannot be predicted. The ArchWare Framework approach recognises COTS products as part of the(More)
This paper analyses the strategic business and IT response of Electric Co, a large electricity company, to deregulation and increased competition in the UK electricity industry. In common with deregulation in other markets such as North America and Australia, the UK regulator has specified strict regulations on how power generators, distribution and supply(More)
Software that cannot change is condemned to atrophy: it cannot accommodate the constant revision and re-negotiation of its business goals nor intercept the potential of new technology. To accommodate change in such systems we have defined an active software architecture to be: dynamic in that the structure and cardinality of the components and interactions(More)
Self-adaptive systems modify their own behaviour in response to stimuli from their operating environments. The major policy considerations for such systems are determining what, when and how adaptations should be carried out. This paper presents mechanisms for feedback and change that support policy decisions for self-adaptation within a computationally(More)
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