This book introduces peer interventions (primarily peer education, peer counselling and peer support) for the positive promotion of health and wellbeing as alternative or parallel methods to traditional clinical processes for reaching hard-to-access populations. It is strongly evidence-based, with chapters discussing reviews of the evidence, followed by important papers with key messages for implementation. Furthermore, it describes implementation and evaluation procedures, both in resource-rich environments and in developing countries. Key Features: Bridges the traditional gap between professional clinical advice and the "real world", reaching where professionals cannot go Brings together information about those interventions that are well evidenced Distils information about how to implement interventions for medical professionals and paraprofessionals and charitable agencies and researchers Presents a fine balance between research and implementation, with evidence-driven guidance