Cognitive therapy (CT), developed by Aaron Beck in the US in the 1960s, is a structured, time-limited, problem-focused and research-based system of psychotherapy which seeks to identify, examine and modify clients' maladaptive thinking found in psychological disorders such as depression and anxiety. The vast literature on CT can appear overwhelming to those interested in practising this therapy. To address this issue, this book serves as an introduction to CT and demonstrates this approach in action.