Assessing the psychometric properties of the 10-item version of the comprehensive assessment of ACT processes (CompACT) in a community-based adult sample

Background: The Comprehensive Assessment of ACT Processes (CompACT) is a 23-item self-report measure of psychological flexibility with evidence of a three-factor structure, convergent and discriminant validity, and reliability. Several short-form CompACT versions, including 18-, 15-, and 10-item forms have been developed. The primary aim of this study was to compare the model fit of each short form and to further examine the convergent and discriminant validity and reliability of the best fitting model in an adult community-based sample in the United States. Method: Participants were recruited for the study via a Qualtrics participant panel. A total of 601 participants completed the CompACT and other self-report measures. Results: A series of confirmatory factor analyses indicated the 10-item version provided the best fit to the data. The 10-item CompACT demonstrated adequate reliability and evidence of convergent and discriminant validity with correlations in the expected direction with psychological distress, life satisfaction, mindfulness, and resilience, but not gender. Discussion: Despite limitations, these results suggest the 10-item CompACT is a valid and reliable measure of psychological flexibility.