The purpose of the research technique called item response theory is to improve the degree to which personality tests are comparable from one group to the next.
In psychometrics, item response theory is a paradigm for designing, analyzing, and scoring tests, questionnaires, and similar means of measuring abilities, attitudes, or other variables.
Item Response Theory (IRT), also known as Latent Response Theory, is the study of implicit traits (unobservable traits or attributes) and their manifestations (ie outcomes, responses, or achievements).
Response Theory was originally developed by Frederic Lord and other psychometricians in the 1950s and 1960s (Lord, 1952; Lord & Novick, 1968) to assess respondents without relying on the same items included in the test. It was developed with the aim of developing a method. (Hambleton & Jodoin, 2003).
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