In modern conditions, with the integration of organizational and technical systems (OTS), the relevance of ensuring interoperability in such systems is increasing. In this paper, the issues of forming a structural-functional model of OTS interoperability are considered. The processes, categories and objects included in the OTS are singled out, their classification is carried out. The factors influencing interoperability at semantic, organizational and technical levels are revealed. The interoperability of the main processes, categories and objects as part of the interoperability model is considered. Recommendations are presented for the further direction of research in order to improve the quality of interoperability in the interaction of OTS.