Today, a large number of services of public importance are accessible and usable via the Internet, thus increasing the role of the availability of internet services in promoting the consumers’ social and economic participation in society. Studies and forecasts for the use of the Internet service suggest a significant increase in the amount of data transmitted in the coming years, which will be influenced, inter alia, by the development and introduction of new content services. Given both the importance of the internet service and the trends in its use, a strategy has been developed at the European Union level and relevant requirements have been implemented to promote the availability and quality of broadband Internet. In the Doctoral Thesis the framework for monitoring and promoting quality and development of broadband Internet has been evaluated, as well as related shortcomings and problems of its actual applicability have been identified. An assessment of end-user's centric Internet quality indicators has been performed and based on mathematical analysis, a concept for determining and reflecting the actual internet service quality values has been developed. Special emphasis is placed on determination of the objective methods for the evaluation of connection speed indicators and definition of measurement principles. The Thesis provides suggestions of determining the areas of insufficient broadband Internet coverage, based on the information obtained within the geographical survey, which in turn can be used to plan the deployment of broadband networks, thus facilitating the availability of universal service in the country. Study results related to the quality of broadband internet services have been summarised in this Thesis. In addition, it contains suggestions for the implementation of a practical methodology that evaluates the quality of the internet service that is being provided.