This Dissertation is intended to examine how marketing managers can utilize the inflow and outflow of knowledge/communication to improve project and firm performance metrics under the open innovation paradigm. The dissertation shows the applicability of the NPD and consumer engagement perspectives to a range of strategic issues, such as management of network and knowledge assets in community-based NPD, management of inflow and outflow openness under team diversity, and utilization of social media marketing and traditional marketing such as advertising to increase new product sales. First, this dissertation reveals that for inflow knowledge management, it is important to take an integrative approach to align knowledge and network assets i...