De flexibiliteits index test (FIT-60): Een Beknopte Beschrijving

Coefficient Alpha and the Internal Structure of Tests

Cronbach, L. J. (1951) · Psychometrika · doi:10.1007/bf02310555 · Cited by 43,931 · see citing works

Using Self-Report Assessment Methods to Explore Facets of Mindfulness

Baer, R. A., Smith, G. T., Hopkins, J., Krietemeyer, J., & Toney, L. (2006) · Assessment · doi:10.1177/1073191105283504 · Cited by 7,511 · cited 1× · see citing works

Constructing validity: Basic issues in objective scale development.

Clark, L. A., & Watson, D. (1995) · Psychological Assessment · doi:10.1037/1040-3590.7.3.309 · Cited by 6,567 · see citing works

Preliminary Psychometric Properties of the Acceptance and Action Questionnaire–II: A Revised Measure of Psychological Inflexibility and Experiential Avoidance

Bond, F. W., Hayes, S. C., Baer, R. A., Carpenter, K. M., Guenole, N., Orcutt, H. K., Waltz, T., & Zettle, R. D. (2011) · Behavior Therapy · doi:10.1016/j.beth.2011.03.007 · Cited by 3,950 · see citing works

The valued living questionnaire: defining and measuring valued action within a behavioral framework

Wilson, K. G., Sandoz, E. K., Kitchens, J., & Roberts, M. (2010) · The Psychological Record · doi:10.1007/bf03395706 · Cited by 518 · cited 1× · see citing works

Acceptance and Commitment Therapy (ACT) in opmars

Mey, H. R. A. D. (2007) · Cited by 2 · see citing works

Efficacy of Acceptance and Commitment Therapy in Daily Life (ACT-DL) in early psychosis: study protocol for a multi-centre randomized controlled trial

Reininghaus, U., Klippel, A., Steinhart, H., Vaessen, T., van Nierop, M. M., Viechtbauer, W., Batink, T., Kasanova, Z., van Aubel, E., van Winkel, R., et al. (2019) · Trials · doi:10.1186/s13063-019-3912-4 · Cited by 100 · see citing works

Blended care in the treatment of subthreshold symptoms of depression and psychosis in emerging adults: A randomised controlled trial of Acceptance and Commitment Therapy in Daily-Life (ACT-DL)

van Aubel, E., Bakker, J. M., Batink, T., Michielse, S., Goossens, L., Lange, I., Schruers, K., Lieverse, R., Marcelis, M., van Amelsvoort, T., et al. (2020) · Behaviour Research and Therapy · doi:10.1016/j.brat.2020.103592 · Cited by 57 · see citing works

Acceptance and commitment therapy in daily life training: a feasibility study of an mHealth intervention

Batink, T., Bakker, J., Vaessen, T., Kasanova, Z., Collip, D., van Os, J., Wichers, M., Germeys, I., & Peeters, F. (2016) · JMIR mhealth and uhealth · doi:10.2196/mhealth.5437 · Cited by 48 · see citing works

How is personality related to well-being in older and younger adults? The role of psychological flexibility

Steenhaut, P., Rossi, G., Demeyer, I., & De Raedt, R. (2019) · International Psychogeriatrics · doi:10.1017/s1041610218001904 · Cited by 37 · see citing works

Gratitude and loneliness in adults over 40 years: examining the role of psychological flexibility and engaged living

Frinking, E., Jans-Beken, L., Janssens, M., Peeters, S. C. T., Lataster, J., Jacobs, N., & Reijnders, J. S. A. M. (2019) · Aging & Mental Health · doi:10.1080/13607863.2019.1673309 · Cited by 31 · see citing works

The psychological impact of the COVID-19 pandemic on Dutch people with and without an inflammatory rheumatic disease

Koppert, T. Y., Jacobs, J. W. G., & Geenen, R. (2020) · Rheumatology · doi:10.1093/rheumatology/keaa842 · Cited by 22 · see citing works

The impact of COVID-19 stress on pain and fatigue in people with and without a central sensitivity syndrome

Koppert, T. Y., Jacobs, J. W. G., Lumley, M. A., & Geenen, R. (2021) · Journal of Psychosomatic Research · doi:10.1016/j.jpsychores.2021.110655 · Cited by 16 · see citing works

Unleashing creativity in people with Parkinson’s disease: a pilot study of a co-designed creative arts therapy

Spee, B. T. M., de Vries, N. M., Zeggio, S., Plijnaer, M., Koksma, J., Duits, A., Stap, T. B., Pasman, G., Haeyen, S., Darweesh, S. K. L., et al. (2025) · Journal of Neurology · doi:10.1007/s00415-024-12878-0 · Cited by 14 · see citing works

What Makes Entrepreneurs Happy? Psychological Flexibility and Entrepreneurs' Satisfaction

van Hugten, J., Hejazi, Z. N. E., Brassey, J., Vanderstraeten, J., Cannaerts, N., Loots, E., Coreynen, W., & van Witteloostuijn, A. C. (2021) · Journal of Business Venturing Insights · doi:10.1016/j.jbvi.2021.e00263 · Cited by 14 · see citing works

Job loss-related complicated grief symptoms: A cognitive-behavioral framework

van Eersel, J. H. W., Taris, T. W., & Boelen, P. A. (2022) · Frontiers in Psychiatry · doi:10.3389/fpsyt.2022.933995 · Cited by 15 · see citing works

Flexibility as a Mediator between Personality and Well-Being in Older and Younger Adults: Findings from Questionnaire Data and a Behavioral Task

Steenhaut, P., Rossi, G. M. P., Demeyer, I., & Raedt, R. D. (2020) · Experimental Aging Research · doi:10.1080/0361073x.2020.1805935 · Cited by 8 · see citing works

Preliminary efficacy of an online intervention based on Acceptance and Commitment Therapy for family caregivers of people with dementia: a feasibility study

Atefi, G., van Knippenberg, R. J. M., Bartels, S. L., Losada‐Baltar, A., Márquez‐González, M., Verhey, F. R. J., & de Vugt, M. E. (2025) · Cognitive Behaviour Therapy · doi:10.1080/16506073.2025.2477600 · Cited by 9 · see citing works

Psychological flexibility in somatic symptom and related disorders: A case control study

Selker, R. J. D. M., Koppert, T. Y., Houtveen, J. H., & Geenen, R. (2024) · Journal of Psychiatric Research · doi:10.1016/j.jpsychires.2024.03.036 · Cited by 8 · see citing works

Loneliness and mental health during the COVID-19 pandemic in the Dutch general population: The moderating role of psychological flexibility

Tilburg, J., Simons, M., Batink, T., Janssens, M., Peeters, S. C. T., Lataster, J., Jacobs, N., & Reijnders, J. S. A. M. (2024) · Heliyon · doi:10.1016/j.heliyon.2024.e37172 · Cited by 7 · see citing works

Predicting clinical outcomes in a blended care intervention for early psychosis: Acceptance and Commitment Therapy in Daily-Life (ACT-DL)

Bonnier, R. A., Beames, J., Kiekens, G., van Aubel, E., Schirmbeck, F., de Haan, L., Marcelis, M., van der Gaag, M., van Winkel, R., van Amelsvoort, T., et al. (2025) · Translational Psychiatry · doi:10.1038/s41398-024-03214-1 · Cited by 4 · see citing works

Psychological flexibility and the moderating role of the therapeutic working alliance in Acceptance and Commitment Therapy in Daily Life (ACT-DL) in an early psychosis samplePreprint

van Aubel, E., Vaessen, T., van Winkel, R., Lafit, G., Klippel, A., Viechtbauer, W., Batink, T., van der Gaag, M., van Amelsvoort, T., Marcelis, M. C., et al. (2022) · medRxiv · doi:10.1101/2022.01.19.22269524 · Cited by 5 · see citing works

Blended intervention based on acceptance and commitment therapy for informal caregivers of people with dementia (ACT-IC): Protocol of a mixed-methods feasibility study

Atefi, G. L., van Knippenberg, R. J. M., Bartels, S. L., Verhey, F. R. J., & de Vugt, M. E. (2023) · BMJ Open · doi:10.1136/bmjopen-2022-070499 · Cited by 3 · see citing works

Age-Related Differences in Psychological Flexibility: A Cross-Sectional Study in a Dutch Population Sample

Slot, M., Reijnders, J. S. A. M., Janssens, M., Simons, M., Lataster, J., & Jacobs, N. (2024) · International Journal of Applied Positive Psychology · doi:10.1007/s41042-024-00194-x · Cited by 4 · see citing works

Dimensions of psychological flexibility and their significance in people with somatic symptoms: The 18-item Flexibility Index Test (FIT-18)

Koppert, T. Y., van Hoek, R., & Geenen, R. (2024) · Journal of Health Psychology · doi:10.1177/13591053241239129 · Cited by 2 · see citing works

The potential role of self-control and psychological flexibility for job satisfaction among working people

de Vries, M. J. (2018) · Utrecht University Repository (Utrecht University)

Psychological Flexibility as Protective Factor in the Relationships of COVID-19 Worry and Stress with Mental Well-being

Buitenhuis, S. D. (2021) · Utrecht University Repository (Utrecht University)

De FIT-60: Nieuwe generatie therapie, nieuwe generatie psychodiagnostiek

van Loghum, B. S. (2013) · Psychopraktijk · doi:10.1007/s13170-013-0030-y

Working through job loss

van Eersel, J. H. W. (2022) · doi:10.33540/1253

Putting up with a pandemic

Koppert, T. Y. (2023) · doi:10.33540/1865

Een kortdurende transdiagnostische ACT-behandeling bij comorbide problematiek

Batink, T. (2024) · doi:10.1007/978-90-368-3025-6_2

Een uitgebreide ACT-behandeling van een neurodiverse vrouw met diverse problemen

A-Tjak, J. G. L. (2024) · doi:10.1007/978-90-368-3025-6_3

Poliklinische ACT-behandeling bij verslaving

Breeuwsma-Geurts, E., & van Yperen, M. (2024) · doi:10.1007/978-90-368-3025-6_8

The Young Ones, pre-post results of a transdiagnostic ACT-training for young adults with Severe Mental Illness

Helmus, K. L., Vink, J. D., Schirmbeck, F. N., de Koning, M. B., Myin‐Germeys, I., & de Haan, L. (2026) · Community Mental Health Journal · doi:10.1007/s10597-025-01564-8

Bewegen richting flexibiliteit met Acceptance and Commitment Therapy (ACT)

Jansen, G., Rinsampessy, D. A., van den Berg, G. J., & Mey, H. R. A. D. (2011) · GZ - Psychologie · doi:10.1007/s41480-011-0010-y

[New generation behaviour therapy; new generation assessment measures; a review of currently available assessment measures].

Batink, T., Jansen, G., & Peeters, F. P. M. L. (2015) · PubMed · Cited by 5 · see citing works

CompACT: developing a complete brief assessment of ACT processes

Francis, A. W., Dawson, D. L., & Moghaddam, N. (2015) · Figshare

It's all about the process: Examining the convergent validity, conceptual coverage, unique predictive validity, and clinical utility of ACT process measures

Rogge, R. D., Daks, J. S., Dubler, B. A., & Saint, K. J. (2019) · Journal of Contextual Behavioral Science · doi:10.1016/j.jcbs.2019.10.001 · Cited by 109 · see citing works

Development and validation of a short form of the Comprehensive assessment of Acceptance and Commitment Therapy processes (CompACT-SF)

Morris, J. L. (2019) · Nottingham ePrints (University of Nottingham) · Cited by 10 · see citing works