Over the past two decades, Parent-Child Interaction Therapy (PCIT) emerged as a leading-edge method for helping parents improve their children's disruptive and oppositional behavior. Today, PCIT has a robust evidence base; is used across the country in settings as diverse as hospitals, mental health centers, schools, and mobile clinics; and is rapidly gaining popularity in other parts of the world. In keeping with this increasing recognition of PCIT's...