RT Journal Article T1 Measuring psychological flexibility and inflexibility: further psychometric evidence of the Multidimensional Psychological Flexibility Inventory short form (MPFI-24) in Spanish population A1 Barrado-Moreno, Victoria A1 Esteve-Zarazaga, Rosa A1 López-Martínez, Alicia Eva A1 Ramírez-Maestre, María del Carmen K1 Tests psicológicos K1 Psicología - Metodología AB The Multidimensional Psychological Flexibility Inventory (MPFI) is a recently developed measure of psychological flexibility and inflexibility (PF and PI) based on the Hexaflex/Inflexahex Model. The aim of this article was to assess the factorial structure, reliability, and convergent and criterion validity of the MPFI-24 in a sample from Spain. The MPFI-24 was tested in a sample of 508 university students (Study 1). Items comprising the acceptance and Experiential Avoidance (EA) subscales were rewritten and tested in a sample of 406 university students (Study 2). Participants completed online cross-sectional surveys including the Spanish MPFI-24, and measures of PF, PI, and mental health. Confirmatory factor analysis showed a six-component first-order factor structure for PF and for PI. The MPFI-24 demonstrated acceptable internal consistency, temporal stability, and convergent and criterion validity. The MPFI-24 is a promising tool. Potential areas for improvement of the measure are discussed. PB Springer Nature YR 2025 FD 2025 LK https://hdl.handle.net/10630/37024 UL https://hdl.handle.net/10630/37024 LA eng NO Barrado-Moreno, V., Esteve, R., López-Martínez, A.E. et al. Measuring psychological flexibility and inflexibility: further psychometric evidence of the Multidimensional Psychological Flexibility Inventory short form (MPFI-24) in Spanish population. Curr Psychol (2025). https://doi.org/10.1007/s12144-025-07421-x NO Funding for open access publishing: Universidad de Málaga/CBUA. This study received Grants PRE2020-093204 and PID2019-106086RB-I00 funded by MCIN/AEI /10.13039/501100011033 by “ESF Investing in your future”, and the Regional Government of Andalusia (HUM-566). Funding for open access charge: Universidad de Málaga / CBUA. DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 21 ene 2026