This textbook draws on academic theory, field research and policy developments to provide an overview of the connections between security and development, before, during and after conflict. Academics and policymakers increasingly argue that security and development are closely related and therefore cannot be achieved independently of each other. This book uniquely combines academic teaching and approaches with practical policy experience in three keys ways: uses the best of recent academic theory, field research and policy to provide an overview of the connections between security and development explores the implications of these connections for the theory and practice of development investigates the challenges that arise for post-conflict reconstruction when we recognize that security and development are mutually contingent. The authors are experienced in both the theory and practice of development and conflict, and illustrate the theory about the links between conflict, security and development with practical examples, drawing on key case studies from the past twenty years. Each chapter is informed by student pedagogy and the book will be essential reading for all students of development studies, war and conflict studies, and human security, and is recommended for students of international security and international relations in general.