Acceptance and Action Questionnaire – version 2 (AAQ-2)

The Acceptance and Action Questionnaire – version 2 (AAQ-II), is the most widely used measure of psychological flexibility. It can be used weekly track how individuals are applying flexibility skills to their daily lives and is often used to measure progress in Acceptance and Commitment Therapy (ACT).



Bond, F. W., Hayes, S. C., Baer, R. A., Carpenter, K. M., Guenole, N., Orcutt, H. K., Waltz, T., & Zettle, R. D. (2011). Preliminary psychometric properties of the Acceptance and Action Questionnaire – II: A revised measure of psychological inflexibility and experiential avoidance. Behavior Therapy, 42, 676–688. 


Berta-Otero, T., Barceló-Soler, A., Montero-Marin, J., Maloney, S., Pérez-Aranda, A., López-Montoyo, A., . . . Demarzo, M. (2023). Experiential avoidance in primary care providers: Psychometric properties of the Brazilian “Acceptance and action questionnaire” (AAQ-II) and its criterion validity on mood disorder-related psychological distress. International Journal of Environmental Research and Public Health, 20(1), 225.

Bohlmeijer, E. T., Fledderus, M., Rokx, T. A. J. J., & Pieterse, M. E. (2011). Efficacy of an early intervention based on acceptance and commitment therapy for adults with depressive symptomatology: Evaluation in a randomized controlled trial. Behaviour research and therapy, 49(1), 62-67.

Fledderus, M., Bohlmeijer, E. T., Smit, F., & Westerhof, G. J. (2010). Mental health promotion as a new goal in public mental health care: A randomized controlled trial of an intervention enhancing psychological flexibility. American journal of public health, 100(12), 2372-2372.

Forman, E. M., Herbert, J. D., Moitra, E., Yeomans, P. D., & Geller, P. A. (2007). A randomized controlled effectiveness trial of acceptance and commitment therapy and cognitive therapy for anxiety and depression. Behavior modification, 31(6), 772-799.

Hayes, S. C., Strosahl, K. D., Wilson, K. G., Bissett, R. T., Pistorello, J., Toarmino, D., Polusny, M., A., Dykstra, T. A., Batten, S. V., Bergan, J., Stewart, S. H., Zvolensky, M. J., Eifert, G. H., Bond, F. W., Forsyth J. P., Karekla, M., & McCurry, S. M. (2004). Measuring experiential avoidance: A preliminary test of a working model. The Psychological Record, 54, 553-578.

Powers, M. B., Vörding, M. B. Z. V. S., & Emmelkamp, P. M. (2009). Acceptance and commitment therapy: A meta-analytic review. Psychotherapy and psychosomatics, 78(2), 73-80

Vowles, K. E., & McCracken, L. M. (2008). Acceptance and values-based action in chronic pain: a study of treatment effectiveness and process. Journal of consulting and clinical psychology, 76(3), 397.