A Note on a Relevance Estimate and Its Improvement In this paper the effect of iterating the improvement procedure is examined. It is shown that applications of the improvement factor beyond the first time are ineffectual, and that the factor is but a scale factor. CACM November, 1968 Korfhage, R. R. information retrieval, relevance, indexing, classification 3.70 3.71 3.74 CA681104 JB February 21, 1978 2:57 PM 1675 5 1675 1675 5 1675 1675 5 1675