Rank order of results in a relevance ranking search is determined by a relevancy algorithm. The factors that make a search result rise in the ranking are: uniqueness of search terms within the database, proximity of search terms to each other within the bibliographic record, number of different search terms present in a bibliographic record, and the fields (e.g., subject heading, author field, title field) in which the terms occur. Some of these, such as subject, carry extra weight.