1. A computer-implemented method of determining a query classification using a computing system having processor, memory, and data storage subsystems, the computer-implemented method comprising: selecting a knowledge domain comprising a set of seed-web domains which are classified to belong to the knowledge domain; for each seed-web domain, implementing a filtered web search of a given query utilizing a filter associated with a particular seed-web domain to obtain a total number of filtered results for the seed-web domain; for each seed-web domain, referencing a total number of non-filtered results; calculating, via the processor, a percentage of coverage for each seed-web domain using the total number of filtered results for the seed-web domain and the total number of non-filtered results for the seed-web domain; and computing an average percentage of coverage for the knowledge domain using the percentage of coverage for each seed-web domain.