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Information retrieval on the Web
Modern information retrieval applies the same principles
In information retrieval, the notion of completeness (recall) becomes more and more meaningless in the context of Web scale information infrastructures.
It is very unlikely that a user requests all the information relevant to a certain topic that exists on a worldwide scale, since this could easily go far beyond the amount of information processing he or she is investing in achieving a certain goal.
Therefore, instead of investigating the full space of precision and recall, information retrieval is starting to focus more around improving precision and proper ranking of results.