This chapter argues that the key to the success of sub-regional cooperation lies in the unlocking of economic forces, trapped hitherto by the political boundaries of nation states, and mobilising the synergies across the border. As Bangladesh, China’s Southwest, India’s Northeast and Myanmar (BCIM) – all have remained relatively underdeveloped, a project-led sub-regional cooperation among these regions will only help in converging the cross-border synergies for development of all the stakeholders.