Reviews the approaches to the organisation of knowledge in Web‐based environments. The control and structure helps searchers to locate information and services, but only provided that searchers understand and relate to the terms and information structure designed into the system. The other alternative is for the searcher to specify the topic of their search through the use of keywords. These keywords are in the natural language of the searcher, which may or not be coincident with the natural language of the Web sites being searched by the search engine. In order to negotiate the variability of natural language the searcher needs to learn to use more advanced search features such as Boolean searching, nesting and truncation. The knowledge organisation issues associated with access to and retrieval from large databases, such as those that are searched across the Web, are significant and need careful and specialist attention.
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