Against the background of an increasingly dynamic and uncertain environment, the role played by the effectiveness and efficiency of the management system in terms of company performance and functionality is becoming ever more significant. The analysis of an organization's management system starts from the assumption that it largely determines the potential for a continual improvement of the organizational performance. At the same time, we can infer that the performance of a company's management system is a prerequisite of organizational performance, respectively that it enables highlighting the best practices in the field and the relevant modes in which it can be influenced. Pragmatically, the research topic aimed to assess and to analyse the effectiveness of management practices and their influence over organisational performance within a multinational company from the Romanian IT&C industry. The study approaches a model for the assessment and analysis of the management system, which is based on the following components represented by statistical variables: the effectiveness of strategic and operational management practices, respectively organisational performance. One of the study's main aspects consists of highlighting the role which the effectiveness of the strategic and operational management practices has in ensuring organizational performance within the analysed company. As a general conclusion which can be drawn after conducting the research, we can state that the studied variables directly impact organizational performance, representing strong predictors for it, ensuring a dynamic balance within the analysed company and thus enabling the fulfilment of objectives and the implementation of changes, when such are required.