Chart note: The average score is composed of scores from three rounds of testing. Our scoring awarded a search engine three points if the first link in the results led to the target answer or site (or if the answer itself appeared at the top of the results page or within the first result). A link to the correct answer as the second or third result was worth two points, and a link to the correct response elsewhere in the top ten results scored one point. If the target answer or item didn't appear anywhere on the first page, we awarded no points to the search engine.
