The analysis of previous research within the process paradigm has shown a lack of studies concentrating on the analysis of structural impact of the process platform on business results, which was the focus of this thesis. The issue of empirically verifiable connection between the extent of maturity of process organisation and the achieved organisational performance was selected as the suitable research problem in this dissertation. The narrower research area concerns the identification of the type and nature of interdependence between the maturity of process organization and the result of business operations of medium-sized and large enterprises, through the identification of mechanisms and empirical evaluation of the impact of maturity of process organization on the performance of medium-sized and large enterprises, which is relevant for providing a scientific contribution, based on the stated previous research. For the purpose of studying the extent of maturity of process organisation and achieved performance of medium-sized and large enterprises in the Republic of Croatia, the following hypothesis has been set: “The level of maturity of process organisation has a positive impact on organisation performance of medium-sized and large enterprises”. The set research model, operationalised through the application of the process maturity model and balanced goal map as the theoretical framework for the selection of enterprise performance indicators, has been shown as valid on the sample of 120 enterprises in the Republic of Croatia encompassed in the study. Using the empirical study, the hypothesis on the impact of maturity of process organization on enterprise performance has been accepted, while it was not possible to prove the impact on financial performance, as was expected.