Some researchers also define an upper number of results for a successful search. Buckland found that the average retrieval set was 98. Blecic reported that Cochrane and Markey found that OPAC users retrieve too much (15 percent of the time).9Wiberly, Daugherty, and Danowski (as reported in Peters) found that the median number of postings considered to be too many was fifteen, although when fifteen to thirty postings wereretrieved, more users displayed them all than abandoned the search.