Unstructured information in the form of natural language text is abundant in various kinds of organisations. To increase information sharing, organisational learning, decision-making and productivity, large amounts of unstructured text need to be analysed on a daily basis. Full text searching alone is not sufficient as a first approach to help users understand what a collection of electronic documents is about, since it does not provide the user with an overview of the underlying concepts in the document collection.
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Uys et al. (2008) studied this question.