The dissertation examines the relationship between the relationship network, BMI and the start-up performance of start-up firms. From the achieved findings and results, the dissertation provides the implications for management to enhance the development of relationship networks, promote the implementation of BMI, and contribute to the improvement of start-up performance of start-up firms in Vietnam. | Summary of Economic Doctoral dissertation: Relationship network, business model innovation and start-up performance of start-up firms in Vietnam