This study outlines the challenges to mutual linkages at a regional level - to social and economic development across the continent. Organised topically and covering all regional groupings in Africa, the study provides a historical overview of integration and common markets of COMESA and ECOWAS, discussion of Africa in the global economy, the question of regionalism in North Africa and the Arab-Maghreb union, the case of the Southern African Development Community, and a survey of the political economy of the Horn of Africa.