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Harvard Group ScaleEdit
Ronald Shor and Emily Carota Orne developed the Harvard Group Scale in 1962. It consists of 12 items of progressive difficulty (as defined, psychometrically, by the percentage of subjects in a normative sample that reports experiencing each particular item) and usually takes around forty-five minutes to complete. The items usually consist of motor tasks and cognitive tasks with the motor tasks being easier to complete. The average score is 5 out of 12. The test is self-scored leaving it open to criticism concerning the validity of the scores.