Cognitive Behaviour Therapy (CBT) has become one of the most influential and widely practised psychological therapies in the world, but its roots stretch back nearly a century. Its development was not the work of one person or one moment, but the gradual merging of two major traditions in psychology: behavioural therapy and cognitive therapy.
The story begins in the early 20th century with behaviourism. Psychologists such as Ivan Pavlov, John Watson, and later B.F. Skinner focused on observable behaviour rather than inner thoughts. Behavioural therapy grew from this movement, using techniques like exposure, reinforcement, and conditioning to help people change problematic behaviours. These methods were especially effective for phobias and anxiety, but they didn’t fully address the role of thoughts and beliefs.
In the 1960s, a major shift occurred. Psychiatrist Aaron T. Beck began studying the thinking patterns of people with depression. He noticed that many of his patients experienced automatic negative thoughts—quick, habitual interpretations that shaped their emotions. Beck developed cognitive therapy, which focused on identifying and challenging these distorted thoughts. Around the same time, psychologist Albert Ellis introduced Rational Emotive Behaviour Therapy (REBT), another approach centred on changing irrational beliefs.
By the 1970s and 1980s, therapists began combining the strengths of both traditions. They recognised that thoughts and behaviours influence each other, and that effective therapy should address both. This integration became known as Cognitive Behaviour Therapy.
CBT continued to evolve through the 1990s and 2000s, supported by a growing body of scientific research. It became the gold‑standard treatment for anxiety, depression, and many other mental health difficulties. Today, CBT is used worldwide and has expanded into specialised forms such as CBT‑E for eating disorders, trauma‑focused CBT, and third‑wave approaches like ACT and DBT.
From its early behavioural roots to its modern evidence‑based applications, CBT has developed into a practical, empowering approach that helps people understand themselves and create lasting change.