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 plurality of seed-web domains which are classified to belong to the knowledge domain; for each seed-web domain, performing a filtered web search of a given query utilizing a filter associated with a particular seed-web domain to identify a total number of filtered documents associated with the seed-web domain that are relevant to the given query thereby resulting in each seed-web domain within the knowledge domain having a corresponding total number of filtered documents; for each seed-web domain, referencing a total number of documents corresponding with the seed-web domain thereby resulting in each seed-web domain within the knowledge domain having a corresponding total number of documents; calculating, via the processor, a coverage for each seed-web domain using the total number of filtered documents associated with the seed-web domain and the total number of documents corresponding with the seed-web domain thereby resulting in each seed-web domain within the knowledge domain having a corresponding coverage, wherein the coverage for each seed-web domain is calculated by dividing the total number of filtered documents pages for the corresponding seed-web domain by the total number of documents for the seed-web domain; and computing an amount of coverage for the knowledge domain using the calculated coverage for each seed-web domain.