This chapter outlines the historical context within which the peace-security-development nexus emerged, reviews academic literature on the topic, and highlights the main on-going relevant debates within first the academic and second the donor community. Evidence regarding the effect of the peace-security-development nexus on the whole-of-government approach in development policy of Western donors is stronger but also needs to be qualified. Donor discourse varies widely regarding the extent of acknowledgement of climate change as a significant future challenge for developing countries. The narcotic crops are significantly more profitable and hence may offer farmers a better means of subsistence but do not fit within the donor-sanctioned model of acceptable development in the Global South. Non-Organisation for Economic Cooperation and Development (OECD) donors have been found to disburse aid largely in line with their own interests. Even the more altruistic OECD donors have frequently not acted on their more humanistic discourse.