This article is devoted to the very urgent problem for imperfection of transparent and competitive system of state support of non-commercial organizations as creation of unified and criteria-based method of assessment and selection of presented socially significant projects by non-commercial organizations, providing two principal characteristics for tenders: transparency of procedure and efficient monitoring at the stage of the best projects ' realization. The article considers the modeling process of the author 's method of expert projects ' assessment. The theoretical base for the development of concept and complex model of social projects ' assessment was general scientific theory of assessment. The development of assessment tools and methods for empiric indicators criteria assessment were based on methodology of system, organizational-administrative, project, process, situation and qualimetic approaches. On the results of the conducted research the authors have developed a scientifically substantiated criteria system of social projects ' assessment, formed a complex model of social projects and initiatives ' assessment and offered the method of empiric indicators of projects assessment criteria changes. The conducted research has an expressed meaning for practical work of experts, who were offered to use the comfortable electronic form of assessment with methodical guides about scale of point assessment, and also for developers-designers, who can get methodical materials for projects 'preparing.