Here's an official post on the subject: http://googleblog.blogspot.com/2008/09/search-evaluation-at-google.html http://googleblog.blogspot.com/2008/09/search-ev

Here's an official post on the subject: http://googleblog.blogspot.com/2008/09/search-evaluation-at-google.html http://googleblog.blogspot.com/2008/09/search-evaluation-at-...