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Strobel, Maria and Bekk, Magdalena and Fischer, Josef and Spörrle, Matthias and Försterling, Friedrich (2008): Development of the Multidimensional Scale of Irrational Beliefs (MSIB). International Congress of Psychology, 20. - 25. July 2008, Berlin, Germany.
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Abstract

The Multidimensional Scale of Irrational Beliefs (MSIB) is a brief and theoretically founded measure of irrational thinking as conceptualized by Albert Ellis in his most recent works on Rational Emotive Behavior Therapy (e.g., Ellis, 2003). With a total of 18 items, it captures demandingness, negative self-evaluation, and low frustration tolerance as the three core aspects of irrationality. Unlike previous irrationality instruments, it is a highly reliable, purely cognitive measure and avoids measuring aspects which are consequences or correlates of irrational thinking (e.g., emotions). Three studies (N = 757) are reported that repeatedly indicate high internal consistency of all subscales (Cronbach’s alpha: .85-.90), factorial validity, and convergent validity with earlier measures.