Parliaments play a pivotal role in governance, and yet little is known about how evidence is used for decision-making in these complex, political environments. Together with its practice companion volume, African Parliaments: Systems of evidence in practice, this volume explores the multiple roles legislatures play in governance, the varied mandates and allegiances of elected representatives, and what this means for evidence use. Given the tensions in Africa around the relationships between democracy and development, government and citizen agency, this volume considers the theories around parliamentary evidence use, and interrogates what they mean in the context of African governance.