The Development and Validation of the Thai-translated Irrational Performance Beliefs Inventory (T-iPBI)

One of the most commonly employed cognitive-behavioural approaches to psychotherapy is rational-emotive behaviour therapy (REBT), but researchers have been troubled by some of the limitations of irrational beliefs psychometrics. As a result, Turner et al. (2018a) developed the Irrational Performance Beliefs Inventory (iPBI), a novel measure of irrational beliefs for use within performance domains. However, the linguistic and cross-cultural adaptation of the iPBI into other languages is necessary for its multinational and multicultural use. The purpose of this paper is to develop the Thai-translated version of the iPBI (T-iPBI) and examine the validity and reliability of the T-iPBI. Data retrieved from 166 participants were analysed using SPSS and AMOS software packages. Thirty-three participants completed two follow-up T-iPBI measurements (1-week and 3-week repeat assessment). After the linguistic and cross-cultural adaptation processes, the T-iPBI demonstrated excellent levels of reliability, with internal consistency and test-retest reliability, as well as construct, concurrent, and predictive validity. The current findings indicate that the 20-item T-iPBI can be used as a self-assessment instrument to evaluate individual’s irrational performance beliefs in a Thai population. We also highlight the implications of this study and suggest a variety of future research directions that stem from the results.
Keywords: Irrational beliefs; iPBI; REBT; Thai; Cross-cultural adaptation