This book provides hands-on recommendations on how to best coordinate development cooperation activities. This interdisciplinary study applies one of sociology’s grand theories to guide its comprehensive field research in two regions. As a result, it analyses how individuals’ actions scale up to organisational behaviour and inter-organisational cooperation. It also deconstructs how bilateral and multilateral organisations are shaped by donors’ national—economical and geopolitical—interests. Moreover, it shows how their employees at the country level balance these objectives with the ideal of transnational solidarity. Finally, it reveals that informal meetings at the sectoral level are the best ways to coordinate and align activities efficiently.