8. The system of claim 6 , wherein the quality measure is determined based, at least in part, on bias information associated with the one of the plurality of query suggestions.
9. The system of claim 8 , wherein the bias information includes at least one of: a length of a prefix of a query, where the plurality of query suggestions are provided based on the prefix of the query; a presentation style of the query suggestion; and a category in which the query suggestion belongs to.