This document provides an introduction to security sector transformation processes in developing countries. It begins by making the case that security sector transformation is needed in Africa to place people at the center of security and protect them from violence. It defines security from a human security perspective that includes both national security and individual protection. The document discusses how transformation differs from and is more profound than reform. It outlines principles of democratic governance that should underlie security sector processes and discusses challenges that African countries face in implementing security sector transformation.