Cognitive Behavioural Therapy is based on both cognitive and behavioural techniques. There are two different strands of CBT, based on Beck’s and Ellis’s theories. All CBT starts with an initial assessment, in which the patient and therapist identify the patient’s problems. Thereafter, the patient and therapist agree on a set of goals, and plan of action to achieve these goals. Both forms of CBT then aim to identify the negative and irrational thoughts; however their approaches are slightly different.Beck’s cognitive therapy will help the patient to identify negative thoughts in relation to themselves, their world and their future, using Beck’s negative triad. Ellis’s Rational-Emotive Behaviour Therapy (REBT) will involve techniques such as empirical argument and logical argument. The patient and therapist will then work together to challenge these irrational thoughts, by discussing evidence for and against them. The patient will be encouraged to test the validity of their negative thoughts and may be set homework, to challenge and test their negative thoughts.