Query expansion (or) is the process of supplement ing or replacing the original query terms with additional terms either at the search formulation or search reformulation stages This can he done automatically by the system or semi-automatically with asststance from the user. Different approaches to implementing or are considered in three on line catalogues. An evaluative study of an automatic on facil ity in ONNPI. an experimental system developed at City Uni versity, revealed that expanded searches were useful to a substantial proportion of users.
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