Item response theory


  • Eutalia Aparecida Candido de Araujo Universidade de São Paulo; Faculdade de Saúde Publica
  • Dalton Francisco de Andrade Universidade Federal de Santa Catarina; Departamento de Informática e Estatística
  • Silvana Ligia Vincenzi Bortolotti Universidade Federal de Santa Catarina



Measurements, methods and theories, Psychometrics, Psychological tests, Questionnaires


The concern with measures of psychological traits is old and many studies and proposals of methods were developed to achieve this goal. Among these proposed methods highlights the Item Response Theory (IRT) that, in principle, came to complete limitations of the Classical Test Theory, which is widely used until nowadays in the measurement of psychological traits. The main point of IRT is that it takes into account the item in particular, not relieving the total scores; therefore, the findings do not only depend on the test or questionnaire, but on each item that composes it. This article proposes to present this Theory that revolutionized the theory of measures.


Download data is not yet available.





Original Article

How to Cite

Araujo, E. A. C. de, Andrade, D. F. de, & Bortolotti, S. L. V. (2009). Item response theory. Revista Da Escola De Enfermagem Da USP, 43(spe), 1000-1008.