“…Users consider three factors when determining the relevance of a document: (1) the information content of the document, (2) whether it contains further references to additional useful material, and (3) the relationship between the document content and personal criteria (Barry, 1998). Of all relevance criteria, “on topic” seems to be the most important and common one (Shaw, 1995, 1996; Wang & Soergel, 1998), or the first one considered (Fister, 1992). The many examples of criteria cited by Barry (1998) include depth, accuracy, clarity, recency, understandability, content novelty, and consensus with other information in the field.…”