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A key to many of the problems encountered in information handling is that whenever we are dealing with objects in text, images, videos etc we are dealing with particular representations of those objects or concepts not the concepts themselves. As humans we can quickly get to the concept from the representations, using our prior knowledge of the world, but media processing and indeed artificial intelligence, is not sufficiently well developed for this to be possible automatically in multimedia systems, except in simple restricted domains. In the MAVIS 2 project we are attempting to address these problems. A new architecture for multimedia content and concept based retrieval and navigation is being developed. The architecture not only presents a consistent cross media approach to CBR and CBN but also includes the integration of a multimedia thesaurus which can substantially improve the flexibility and versatility of …