A coverage evaluator determine search results that are a subset of potential search results, the search results provided in response to search requests, wherein a covered portion of the potential search results are associated with quick review information and a non-covered portion of the potential search results are not associated with quick review information. A coverage calculator may calculate a coverage of search results, based on a relation of covered, weighted impressions of the covered portion to weighted impressions, wherein the weighted impressions include non-covered, weighted impressions of the non-covered portion, if any.