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An Experiment is a type of Campaign that allows you to run controlled tests on your website. Users assigned to the Campaign randomly view one of the treatments that are part of the test. This ensures that each treatment is viewed by a representative, unbiased sample of your users. Controlled tests include a group of users who view no treatment (i.e., your control) as a basis for comparison to the treatments being tested. SiteSpect automatically creates a Control Group in each Campaign.