The trialogue process, reflected by the integration and interaction between civil actors, private sector and public organizations in the design of public open spaces is, and will always be, a hot issue in the urban life of many cities, thus raising some challenging questions concerning the role of public spaces and the nature of public life of cities and their inhabitants. An essential quality of urban public spaces is that they meet the needs of users. Consequently the involvement of citizens in the design of open spaces plays a critical role in the sustainability of such spaces. On the other hand, both the private sector and public organizations are essential for the existence and construction of public open spaces. The paper will investigate the trialogue addressed between the three sectors, civil actors, the public sectors and the private organizations in the design and management of open spaces with reference to Cairenes’ society. The following questions will be raised, where the study will attempt to seek the answers; to what extent is the involvement of the three in the design and management of local public spaces? Does the use and quality of such open spaces differ according to the degree of involvement of each of the three sectors?