How does Google evaluate algorithmic changes?

What are some of the metrics that Google uses to evaluate whether one iteration of the ranking algorithm is delivering better quality results to users than another? James Foster, Sydney, Australia Learn more about search evaluation at Google: http://googleblog.blogspot.com/2008/09/search-evaluation-at-google.html http://www.google.com/insidesearch/howsearchworks/algorithms.html Have a question?

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