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and not useful links, the damage is limited: The user only wastes time selecting links. In many cases, however, the user cannot judge whether or not a given link will turn out to be fruitful. In that case he or she has to follow the link and to read or skim another document. The worst case scenario
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categories are assigned to a document, recall may decrease. If too many non-relevant categories are assigned, precision becomes lower. The hard job is to say which categories are fruitful or
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is, of course, that even after reading the new document the user is unable to decide whether or not it might be useful if its subject matter is not thoroughly investigated.
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way. If the system is inconsistent, it means that when the user considers the links in a given category, he or she will not find all documents relevant to that category.
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Overcategorization also has another unpleasant implication: It makes the system (for example
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the links are. If the user is able to distinguish between
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120:November 2011
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