The optimal structuring of menu indexes in computerized information retrieval is examined. The number of alternatives per page that minimizes search time is determined as a function of the human and machine factors of search strategy, scanning time, key-press time, and computer response time. For a wide range of conditions, the optimal number of alternatives per page is in the range of from four to eight, with limiting integer values of three and four for exhaustive and self-terminating search, respectively.
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