Tics affect more than 10% of the population, and can be an unpleasant and disruptive problem. They include chronic tic disorder, Tourette's syndrome and habit disorders such as hair pulling, nail biting and scratching. Treatment is either by medication (without convincing evidence) or psychological means. Before the introduction of habit reversal psychologists had no real alternatives to offer, and even this method lacks evidence for its efficacy and is not widely used. Illustrated throughout with case study examples and containing detailed guidelines for patient and therapist on the use of...