In the light of the annual increase in the range of services provided via the Internet, as well as the increasing amount of online content, the quality of Internet access service, especially in the case of the mobile network, where the number of end-users already significantly exceeds the number of landline end-users, is becoming increasingly important when assessing the possibility of receiving the service or accessing content. Consequently, a regulatory framework is provided, within the framework of which the responsible authorities must ensure an open and transparent assessment of the Internet access service. In the Doctoral Thesis, a study has been carried out, within the framework of which the process of monitoring and evaluating the quality of Internet access service has been examined and evaluated, in regard to the choice of the type of measurements depending on the requirements of the regulatory framework and the objectives of performing measurements, factors affecting the measurement and other technical and regulatory aspects. In addition to the norms specified in the regulation, the Doctoral Thesis proposes and practically evaluates the additional criteria for placement of the measurement equipment, which are based on the assessment of signal parameters. As a result of the research, guidelines for the performance of measurements of the quality of the Internet access service have been developed, which provide a specific set of activities and conditions, determining the time of the measurements, the location of measurement equipment, values of reference parameters, and other conditions in order to ensure openness and transparency of the measurement process, as well as comparability and objectivity of measurement results.