This book is a rare peek into the divergent--and at times contentious--points of view among world's leading researchers on what the condition of mental retardation is and how it should be defined, measured, and implemented in the 21st century. It is a candid and insightful collection of essays from experts on issues ranging from whether mental retardation really is a slowing of mental development and what the disability should be called, to how cultural norms affect the definition of the condition worldwide. Students, researchers, teachers, and practitioners--will find a forum that is passionate and engaging. This group of professionals, is truly concerned about the welfare of persons with intellectual disabilities and view mental retardation as a condition that can be enhanced by the provision of supports as opposed to a static, lifelong disability. Following a dedication, 3 forewords, and a preface, this book is divided into three parts: (1) The Concept of Mental Retardation: Critical Issues 2005; (2) The 2002 AAMR System and Its Critics and Supporters; and (3) Emerging Models and Definitions of Mental Retardation.