Objectives. The aim of the study was to assess psychometric properties, validity and internal consistency of the Slovak version of the Proactive Coping Inventory (PCI). The article deals with: a) factorial structure of the PCI, b) item analysis and internal consistency of its scales, c) discriminant validity. Subjects and settings. The sample consisted of employed adult people from all main regions in Slovakia, 22% were men and 78% women. Their age ranged from 20 to 60 years, with mean age 38.62 (SD=10.78). Statistical analysis. Confirmatory factor analysis was used to test the models, Maximum Likelihood (ML) method, the goodness of fit indexes: χ2 test, χ2/df, RMSEA, 90% CI for RMSEA, CFI, GFI, and information criteria AIC, BIC. Item analysis was conducted by descriptive characteristics and popularity index p. Internal consistency was assessed by coefficients α and ω, statistical relationships were tested using Pearson's correlation coefficient. Results. None of the presented models (seven, three and one factor models) fits the data well. Modified one-factor models fit the data well. Internal consistency is low in all scales (α=ω=.55-.78). Item analysis identified several problematic items. There are significant relationships between the PCI scales. The results open the space for discussion, whether the problem is affected mainly by translation or if it corresponds with the original scale construction. The current studied Slovak version of the PCI does not meet required psychometric properties and several further modifications are needed: to improve the fit of multifactor models of the PCI and significantly increase the internal consistency of the PCI. Study limitations. The sample is not representative due to nonprobabilistic sampling method and higher percentage of women. The exploratory character of the PCI models modifications is also considered as a study limit. [ABSTRACT FROM AUTHOR]