Social innovation brings to inclusion and wellbeing, improving the quality of life and socio-economic performance and enhancing the society’s collective power and resources. Therefore, it is of utmost importance to promote social innovation processes in any society, providing research for getting the understanding of different aspects of it, including the main actors and the extent to which they are involved in social innovation. The research presented in this paper reveals the main stakeholders of social innovation and analyses the methodology elaborated by the authors for determining the involvement of the society in social innovation processes at financial, organisational and informative levels. Corresponding indices defined and determined for the case of Latvia reveal that the level of overall involvement of the society in social innovation processes here is lower than average