Altan-Atalay, A.Kaya-Kızılöz, B.Özdemir, A.B.2025-06-152025-06-1520252602-4438https://doi.org/10.57127/kpd.26024438.1467849https://hdl.handle.net/20.500.12469/7367The Mistake Rumination Scale (MRS) was developed to evaluate the inclination to engage in mistake rumination (MR), a reaction to perceived mistakes in the form of intense, repetitive negative thoughts. The present study aimed to investigate the psychometric qualities of the Turkish version of the MRS in 2 studies. Data were collected from 214 participants (118 females) between the ages of 18 and 56 (M = 33.45, SD = 11.82) through measures of MR, repetitive negative thinking, per-fectionism, procrastination, depression, and anxiety. The findings confirmed the original factor structure and indicated adequate reliability, convergent, and incremental validity. In the second study, the criterion-related validity of the MRS was tested using an experimental design. Participants (127 individuals aged between 18 and 28) were asked to imagine committing a series of mistakes or a regular event. Results provided support for the criterion-related validity of the MRS. In conclusion, MRS can be utilized to assess MR in Turkish individuals. © 2025, Association for Clinical Psychology Research. All rights reserved.eninfo:eu-repo/semantics/closedAccessFactor StructureMistake RuminationReliabilityRepetitive Negative ThinkingValidityArticle14261910.57127/kpd.26024438.14678492-s2.0-105005551166N/AN/A