Assessing process maturity of network service companies allows not only to get an idea of the current level of work with business processes, but also to see shortcomings and shortcomings in their description and help managers make informed management decisions to achieve business development goals. Today, there are various models of maturity levels, but they are all based on the evolutionary, consistent development of the organization. It is important to understand that changes related to the improvement of the management system may not occur sequentially: in some areas, the company can move far, in others, on the contrary, it can lag far behind. Therefore, maturity levels can overlap, making it difficult to determine the exact stage of a firm's development. In this regard, in this study, it is proposed to assess the level of process maturity based on the following system methods and models: Capability Maturity Model Integrated (CMMI), Business Process Management Maturity Model (BPMMM), and Process and Enterprise Maturity Model (PEMM).