This publication is devoted to the analysis of historical experience and modern trends in the development of Armenians in some countries, to determine the prospects for methodological developments in their study. It consists of three parts. The first part concerns to the methodological problems of studying the Diaspora and includes articles that examine the principles of resource analysis of Diasporas, as well analysis of integration and relationships with the homeland and social involvement. The second part presents studies of the modern Armenian communities of Kuwait, Belarus, Czech Republic, Lebanon, and Cyprus, which refer to specific research issues. The third part is a historical excursus of the past of the Armenian communities of Medieval Europe, Constantinople of the 10th century, and an analysis on the cultural heritage of the Armenians of Turkey and Iran created over a thousand years.