Empirical evidence shows that treatment failure is a significant problem and one that practitioners routinely overlook. A substantial minority of patients either fail to gain a benefit from the treatments offered to them, or they worsen by the time they leave treatment. Intervening in a timely fashion with such individuals cannot occur if practitioners are unaware of which cases are likely to have this outcome. Prevention of Treatment Failure describes procedures and techniques that can be used by clinical practitioners and administrators to identify patients who are at risk for treatment failure.