Testing a bifactor model of the comprehensive assessment of acceptance and Commitment Therapy Processes (CompACT) in Finnish and British populations
Gallego, Ana (Universitat de Girona. Departament de Psicologia)
Navarrete Hidalgo, Jaime (Parc Sanitari Sant Joan de Déu)
Gorinelli, Simone (University of Jyvaskyla (Finlàndia))
Brandolin, Francesca (University of Jyvaskyla (Finlàndia))
Lappalainen, Päivi (University of Jyvaskyla (Finlàndia))
Golijani-Moghaddam, Nima (University of Lincoln)
Dawson, David L. (University of Lincoln)
Lappalainen, Raimo (University of Jyvaskyla (Finlàndia))
Luciano, Juan Vicente (Universitat Autònoma de Barcelona. Departament de Psicologia Clínica i de la Salut)

Date:	2025
Description:	12 pàg.
Abstract:	Introduction: Psychological flexibility is a core concept in Acceptance and Commitment Therapy, with several self-report instruments developed to measure it. One multidimensional measure is the Comprehensive Assessment of Acceptance and Commitment Therapy Processes (CompACT). This study is the first to test a bifactor structure of the CompACT providing new insights into its dimensional structure and how scores should be computed. Additionally, the study validates the Finnish version of the instrument. Methods: Data from five distinct non-clinical Finnish (n = 281) and British samples (n = 690) were obtained. The internal structure of the CompACT was examined through confirmatory factor analysis. For the Finnish samples, reliability, construct validity, and sensitivity to change were also performed. Results: The bifactor structure was the best-fitting model across Finnish and British samples, supporting both a general psychological flexibility factor and three specific subcomponents: openness to experience, behavioral awareness, and valued action. The Finnish version of the CompACT demonstrated good internal consistency, strong construct validity, and significant correlations with mindfulness, well-being, stress, and depression measures. Additionally, the measure was sensitive to change in psychological flexibility following ACT-based interventions, with moderate-to-large effect sizes. Discussion: This study represents a significant advancement in the psychometric evaluation of the CompACT, providing the first empirical evidence that a bifactor model offers the optimal structural representation of the measure. The bifactor structure supports, for the first time, the computation of both an overarching psychological f lexibility score and subscale scores in the CompACT, reinforcing the theoretical conceptualization of psychological flexibility. These findings contribute to the refinement of psychological flexibility measurement and offer valuable insights for both research and clinical applications. Future studies should further investigate the bifactor model's added value over other established measures of psychological flexibility.
Grants:	Instituto de Salud Carlos III PI22/00829
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Acceptance and commitment therapy ; Psychological flexibility ; Confirmatory factor analysis ; Bifactor
Published in:	Journal of Contextual Behavioral Science, Vol. 38 (October 2025) , ISSN 2212-1447

DOI: 10.1016/j.jcbs.2025.100952

12 p, 3.1 MB

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