This Field Study Project is concerned with New Generation Access Networks (NGAs). In particular, the investments on this field in other countries are studied and the regulatory rules on NGAs are researched. In the beginning, the international experience on this issue is presented through the study of four countries in terms of three basic pillars of analysis: investments, regulation and economic growth due to NGAs. Furthermore, a comparative analysis and evaluation of these four countries follows though various selected indicators and graphs and the corresponding conclusions related with the sustainable development of NGAs and their contribution to the social and economic environment are denoted. In the last chapter of the Field Study Project, the situation regarding NGAs in our country is presented and after its evaluation, the conclusions and recommendations about NGAs in Greece are exhibited.