This experiment was designed to assess the ability of item writers to construct truly parallel tests based on a "duplicate-construction experiment" in which Cronbach argues that if the universe description and sampling are ideally refined, the two independently constructed tests will be entirely equivalent, and that within the limits of item…

Current scoring procedures depend on unrealistic assumptions about subjects' performance on the rod-and-frame test. A procedure is presented which corrects for constant error, is sensitive to response strategy and consistency, and examines qualitative and quantitative aspects of performance and individual differences in laterality bias as defined…