In 1995, we published a text called, Parent-Child Interaction Therapy: A Step-By-Step Guide for Clinicians, which provided a clinical description of PCIT for the treatment of two- to seven-year-old children with disruptive behavior problems. Since that time, PCIT has been disseminated widely across the United States and abroad. Numerous additional studies have been conducted regarding the efficacy of PCIT with a variety of populations. Subsequently, demand has been increasing for an expanded textbook that summarizes the research regarding clinical innovations in the program as well as...