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To apply it outside such settings, however, has until recently been a major undertaking. Any foray into the randomized testing of management ideas—that is, the random assignment of subjects to test and control groups—meant employing or engaging a PhD in statistics or perhaps a “design of experiments” expert . At eBay, there is an overarching process for making website changes, and randomized testing is a key component. ALL BLOGS THINGS Measures of page views and bid counts suggest that the redesign was very successful. Tests are most reliable where many roughly equivalent settings can be observed. This might mean physical sites, as with Sears’s stores, or it might mean more ephemeral settings, such as alternative website versions. Among the earliest and most extensive users of testing are retail and restaurant chains. Because so much is held constant among their multitudinous sites, it is easy to designate which ones will serve as experiments and which will serve as controls an...