Book excerpt: Tangolo and Massi offer a complete manual for transactional analysis (TA)-based group therapy. Group Therapy in Transactional Analysis demonstrates the evolution of TA as a relational psychodynamic therapy rich in clinical experiences both within individual and group settings. The authors outline how to select clients, which setting to provide, how to establish contracts, and which techniques to use during group sessions. The book includes a full assessment of research and theory, clearly demonstrating efficacy and taking into account neuroscientific studies on intersubjectivity and the social brain. This is combined with a practical approach which supports therapists from the very first steps to the analysis of more complex interpersonal dynamics and dream analysis in a group setting. Finally, future research directions are discussed, together with an overview of an experiment on online groups in the time of coronavirus. This foundational text will be a key reference for therapists in training and professionals new to the principles of transactional analysis. It will also be of interest to students on psychotherapy training and clinical psychology courses.