Why do certain parts of the state in Africa work so effectively despite operating in difficult governance contexts? How do 'pockets of bureaucratic effectiveness' emerge and become sustained over time? And what does this tell us about the prospects for state-building and development in Africa? Repeated economic and social crises have demanded that development thinkers and policy actors have had to engage with the critical role that states play in delivering development. Pockets of Effectiveness and the Politics of State-building and Development in Africa shows that politics is the driving factor that shapes how well state agencies perform their roles. It deploys a new conceptual framework - the power domains approach - to explore the shifting fortunes of key state agencies in five countries - Ghana, Kenya, Rwanda, Uganda, and Zambia - over the past three decades. Our original research reveals when, how and why political rulers decide to build effective state agencies and enable them to deliver certain forms of economic development - often through forming strategic coalitions with senior bureaucrats and with international support - and also when this support falters and gives way to a politics of survival. Comparative analysis identifies two potential trajectories towards state-building in Africa, each shaped by different configurations of social and political power. The book critiques the role that international development agencies have played in (mis)shaping the state in Africa and suggests a new strategic agenda for building the state capacities required to deliver sustained development at the current juncture. The book closes with critical commentaries from two leading scholars in the field, to help place our work in context and establish the next steps for research and strategy in this increasingly important area of development theory and practice.