A computer-implemented method for processing query information includes receiving prior queries followed by a current query, the prior and current queries being received within an activity period an originating with a search requester. The method also includes receiving a plurality of search results based on the current query. Each search result identifying a search result document, each respective search result document being associated with a query specific score indicating a relevance of the document to the current query. The method also includes determining a first category based, at least in part, on the prior queries. The method also includes identifying a plurality of prior activity periods of other search requesters, each prior activity period containing a prior activity query where the prior activity query matches the current query, and where the prior activity period indicates the same first category. The method also includes obtaining category based selection statistics of the other requesters search results based on the last queries of the other activity periods. The method also includes obtaining general selection statistics of a more general population of requesters based on the current query. The method also includes generating adjusted scores for the search result documents by adjusting the respective scores based on the query specific score and the category specific score. The method also includes ranking the search result documents according to the respective adjusted scores.