The aim of this thesis is to carry out analysis of methods of evaluating project management maturity, to use a selected method on a specific company, and to propose appropriate arrangements in order to improve the level of project management in the selected company. The thesis deals with important terms such as project, and project management. The next part contains the analysis of methods of evaluating project management maturity. From these methods, the author chose the CMMI model, applied it to a specific company, and proposed specific arrangements.