Most eParticipation initiatives have social, economic and environmental costs, financed in most cases with public funds, so it would be convenient to evaluate them in order to be transparent and consistent with the strategic objectives pursued. Thus, it is necessary to quantify, monetarily, both the economic, social and environmental aspects, and the value added generated by the practical application of this type of eParticipation initiatives. The main objective of this paper is to value, in monetary terms, the social and economic aspects of the implementation and development of an eParticipation experience based on eCognocracy. This evaluation will allow us to obtain the social and economic information as to the true value added that these initiatives contribute to society in general, and to give an appropriate answer to the new challenges and necessities in the sphere of public decisions that arise within the Knowledge Society.