Coordination is an important function in both Hierarchies and Markets. The coordination function assumes greater importance as e-commerce firms move from an inventory-model to a marketplace model. Additionally, increasing smartphone penetration has led to proliferation of platform operators experimenting with On-Demand services like ride-hailing and home services, which require coordination between large crowds of customers and service providers. The need for coordination increases even more sharply in Sharing Economy with peer-to-peer interactions for collaborative sourcing, collaborative production and collaborative consumption. A common construct in all these diverse platforms and markets is the need to coordinate a large number of individuals with varying needs, capabilities and motivations. Instead of a “Command and Control” orientation in Hierarchies, managers need to adopt a “Coordinate and Cultivate” (Malone, T.W., "The Future of Work", Harvard Business School Press, Boston, 2004.) orientation in dealing with the Crowd. The role of the coordinator potentially allows access to sensitive information about individual members of the Crowd and hence there are needs for designing safeguards and self-regulation for sustainability of the business model. The MDP “Coordinating Marketplaces and Platform Businesses” aims to build an understanding of the different strategic choices inherent in coordinating the diverse business models.