Book excerpt: This book contains the lectures of the 2nd ITER International Summer School (2008), which was held in conjunction with the 47th Summer School of JSPF for Young Plasma Scientists at Kyushu University during July 22-25, 2008. The theme of the school, “Confinement (from device to plasma)”, was to provide a comprehensive knowledge for fusion research in the ITER era. Fusion research will enter a new phase with ITER, characterized by plasmas with substantial fusion reaction rates, run by an international collaboration effort. Recognizing this new challenge, this book uniquely addresses the definition of mission, the design of device and the knowledge bases for its completion in a consistent manner. This book aims to prepare young researchers to tackle the current and anticipated challenges of magnetic fusion devices, and to disseminate the global knowledge required for a timely and competent exploitation of the ITER physics potential.