Realization of the operational aims of the organization, planned within the range of the integrated quality, environmental and occupational safety management system, very often remains unintegrated, which in turn creates the necessity for searching the new solutions ensuring the real integration, which has been confirmed by the literature review and the initial analyses. The originality of the study is due to the authorial method of the integrated assessment of the process, which enables pointing its key operational criteria by valuing the difficulty of realization as well as valuing the integrated risk for each of the operational criterion. The developed methodology has been applied in the organization being in possession of the implemented integrated management system, however, describing the operational level of this system as the unintegrated one. The effect of implementing the methodology of operational processes criteria assessment, pointing the key criteria and their operational monitoring, was, confirmed by the organization, improvement of the actions effectiveness within the range of integration in planning and realizing the aims. Findings of the research are as follows: the developed methodology of the operational criteria assessment can constitute the complex tool for assessment of the realized by the organization processes in the context of possibilities for integrated fulfillment by these processes the following requirements: quality, environmental and occupational safety, and simultaneously giving the guidance for improving them. The methodology can also be the integral part of the operational control model being the base for ensuring the supervising conditions in the organizations which in the future will be willing to adjust their processes to the Operational planning and control requirements of the following amended norms: ISO 9001, ISO 14001 as well as ISO 45001.