Purpose: The interaction among coaches, parents, and athletes has a valuable impact on youth sport participation. Thus, due to the importance of the topic and the lack of an instrument to measure this construct, the aim of the present study was to investigate the psychometric properties of the Persian version of Coach–Athlete–Parent Questionnaire.

Methods: The type of this study was descriptive and aimed at psychometrics. The measurement tool was the "Positive and Negative Processes in Coach–Athlete–Parent Relationship" questionnaire which consists of two subscales and 11 items on a five-point Likert that 683 questionnaires of this tool were completed by male and female Coaches, Athletes and Parents in Tehran using stratified random sampling. Original version of this questionnaire were developed by Lisinskiene et al (2019). In the present study, confirmatory factor analysis was used to determine construct validity, the test-retest method was used to calculate temporal reliability, and Cronbach’s alpha was used to examine internal consistency.

Results: The results indicated all items had acceptable relative fit. temporal reliability and internal consistency were satisfactory. Findings suggest the present questionnaire supports two-dimensional approach of this construct and the validity and reliability of the questionnaire are confirmed.

Conclusion: Therefore, the present questionnaire can serve as a valid tool for sports experts who seek to assess interpersonal relationships among the coach–athlete–parent triad. Consequently, the Persian version of this questionnaire is recommended for measuring this construct among coaches, athletes and parents.

Keywords: coach, athlete, parent, interpersonal relationships