This book provides the theoretical underpinnings, research, support, and techniques, to implement open-access/single-session therapy. Open-access services have moved beyond walk-in or drop-in services and expanded to on-demand teletherapy, virtual, or same-day scheduling.This book explains how best to implement single-session therapy in all such services, highlighting how this kind of therapy can reduce barriers to care.It includes chapters on training single-session therapists, global applications, and major obstacles.A team of expert contributors provide clinical examples and applications from around the world. This book is essential for clinicians and professionals offering or thinking about offering single-session therapy in open-access services.