The Overvalued Ideas Scale predicts this disorder's treatment outcome. Wayne K. Goodman designed the Yale-Brown scale used to diagnose this disorder, which can be treated with a type of CBT known as exposure and response prevention. This non-autism disorder names a "spectrum" that also includes body dysmorphic disorder and Tourette's syndrome. It is distinguished from a similarly-named personality (-5[1])disorder due to being (10[1])egodystonic (ego-dis-tonic), or incompatible with the patient's self-concept. Excessive rumination is present in the "Pure (10[1])O" form of this disorder, which does not involve physical actions. This disorder is characterized by distressing intrusive thoughts that can often (10[1])be (10[1])relieved by repetitive (10[1]-5[1])"rituals." For (10[1])10 points, name this disorder whose (10[1])patients may feel a need to repeat acts such as nail-biting or (10[1])hand-washing. (0[1])■END■