22. The computer-implemented method of claim 19 , where generating the first set of context data includes generating a first list of categories relevant to the search query, and where generating the second set of context data includes generating a second list of categories using the one or more new queries.
22. The computer-implemented method of claim 19 , where generating the first set of context data includes generating a first list of categories relevant to the search query, and where generating the second set of context data includes generating a second list of categories using the one or more new queries. 23. The computer-implemented method of claim 22 , where comparing the first set of context data with the second set of context data includes determining a proportion of categories that are common to both the first list of categories and the second list of categories.