The readers are offered the third in a series of publications dedicated to the interaction between the cultural community, urban planning specialists, city and state authorities during the reconstruction of the Lebanese capital Beirut after the civil war of 1975-1990. The example of Beirut is the most important historical precedent, on which, in particular, the development of a general strategy for promoting the revival of the destroyed cities of the Arab world can be oriented. Beirut has a number of features common to almost every major Arab city, including ethnic fragmentation and economic diversity, political divisions that are sharp to the point of antagonism, and multi-denominationalism. For the first time in modern history, the reconstruction of Beirut was carried out under the strong influence of civil society and its organizations, and not only political parties, but also non-governmental organizations (so-called third sector organizations), as well as new target groups, movements and currents. The story of Beirut's post-war reconstruction and civil influence on it can be seen as a unique example of a long-lasting and quite fruitful participation program. Studying the genesis of such large-scale, multi-professional and multi-purpose public participation could be the key to developing organic and effective approaches to large cities in various regions affected by the consequences of wars, civil conflicts or natural disasters. The methodology of such research should be based on the reconstruction of the chronological sequence (timeline) of key events during the post-war reconstruction of the Lebanese capital. On this schedule, it is necessary to pay special attention to situations of intervention of public organizations and/or the third sector in the processes of implementation of design and construction, distinguishing at the same time the modes (stages) of preparation and implementation of influence. The general goal of this research is to reveal the content, mechanisms of implementation and stages of deployment multifaceted processes of discovering and preserving the rich historical heritage of Beirut, which took place in a constant dialogue between specialists of various professions, scientists and public activists. The purpose of this publication is to build a work plan of the research, define its specific components and characterize the expected scientific and practical results.