Turkish Adaptation and Psychometric Evaluation of the Measure of Processes of Care for Service Providers in Pediatric Care and Rehabilitation

Background/Objectives: Family-centered services (FCSs) are a key approach in pediatric healthcare and rehabilitation that promotes collaboration between service providers and families. The Measure of Processes of Care for Service Providers (MPOC-SP) is widely used to evaluate family-centered services from the provider perspective; however, no validated Turkish version is available. This study aimed to translate and culturally adapt the MPOC-SP into Turkish and to examine its factor structure, internal consistency, test–retest reliability, measurement error, and supplementary model-based construct indices among Turkish-speaking service providers working in pediatric healthcare, disability, and rehabilitation settings. Methods: The MPOC-SP was translated and culturally adapted following a structured cross-cultural adaptation process. A total of 267 service providers from multiple professional disciplines, institutional settings, and 15 provinces of Türkiye participated in the psychometric evaluation. Internal consistency was assessed using Cronbach’s alpha and McDonald’s omega. Test–retest reliability was evaluated in 86 participants using ICC(2,1), and measurement error was examined using the standard error of measurement (SEM) and minimal detectable change at the 95% confidence level (MDC95). The hypothesized four-factor structure was evaluated in 267 participants using confirmatory factor analysis based on polychoric correlations and diagonally weighted least squares (DWLS). Composite reliability, average variance extracted, the Fornell–Larcker criterion, and the heterotrait–monotrait ratio were examined as supplementary model-based indices. Institutional-group comparisons were exploratory. Results: The four subscales demonstrated high internal consistency, with Cronbach’s alpha coefficients ranging from 0.884 to 0.968 and McDonald’s omega coefficients from 0.885 to 0.968. Test–retest reliability was good to excellent (ICC[2,1] = 0.819–0.963), although small systematic decreases were observed for SIS and CSI. SEM values ranged from 0.228 to 0.328 and MDC95 values from 0.633 to 0.908. The four-factor model showed a good fit (χ2(318) = 463.24, CFI = 0.998, TLI = 0.998, RMSEA = 0.041, 90% CI [0.033–0.049], SRMR = 0.057), with standardized factor loadings ranging from 0.761 to 0.933. Composite reliability ranged from 0.899 to 0.976, AVE from 0.640 to 0.800, and HTMT values from 0.372 to 0.664. No substantial ceiling effects were observed at the subscale level; however, 14 of 27 items exceeded the predefined 15% criterion for item-level ceiling effects. Conclusions: The findings provide initial evidence supporting the four-factor structure and reliability of the Turkish MPOC-SP in this sample of service providers. Interpretation should focus on the four established subscales rather than an overall total score. Further studies in independent and more balanced samples are needed to examine external construct validity, measurement invariance, responsiveness, and clinically meaningful change.