Book excerpt: Systems Theories for Psychotherapists explores three key theories that underpin many of the models of psychotherapy: general systems theory, natural systems theory, and language systems theory. The book presents the aesthetics (how to see and understand what is happening) and the pragmatics (what to do in the therapy room) behind each theory. It also explores how therapists can successfully conceptualize the problems that clients bring to therapy, offering a range of contemporary examples to show how each theory can be applied to practice. Starting with an introduction to systems theories, the book then delves into cybernetics, interactional systems, natural systems, constructivist theory, and social construction theory. Each chapter uses a distinctive case example to help clinicians to better understand and apply the theories to their own therapeutic setting. Woven throughout the book are three helpful learning tools: "Applying Your Knowledge," "Key Figure," and "Questions for Reflection," providing the reader with the opportunity to critically engage with each concept, consider how their own world view and preconceptions can inform their work with clients, and challenging them to apply prominent systems theories to their own practice. Systems Theories for Psychotherapists is a clear and valuable text for undergraduate and graduate students in mental health programs, including counseling, marriage and family therapy, social work and clinical psychology, as well as for all practicing clinicians.