The corporate social responsibility (CSR) is no longer a choice and now firms are increasingly engaging in social initiatives by approaching it strategically. There have been many attempts to foster competitiveness for firms’ social engagement and focusing on social partnership and social cluster has been one of the important areas where firms can increase the efficiency in creating shared value. The purpose of this paper is to discuss the multi-sector partnership and cluster. Then, it introduces a new conceptual model for multinational corporations’ motivations and benefits in engaging in multi-sector collaboration by incorporating the diamond model. This paper shows that social partnership or cluster can be more synergized and facilitated when understood with the four purposes: efficiencyseeking, solution-seeking, network-seeking, and strategic allianceseeking.