ABSTRACT
Th ere is clear evidence that a signifi cant number of children and adolescents have severe and impairing emotional or behavioral problems (Frick & Silverthorn, 2001). Further, research has indicated that the form that these problems take can largely be conceptualized along two broad dimensions. One dimension, which is the focus of the current chapter, has been labeled as undercontrolled or externalizing and includes various acting out, disruptive, delinquent, hyperactive, and aggressive behaviors. Th e second dimension has been labeled as overcontrolled or internalizing and includes such behaviors as social withdrawal, anxiety, and depression (see Ollendick, et al., this volume). Th is basic distinction between internalizing and externalizing problems has been well supported by a number of factor analytic studies (Achenbach, 1995; Achenbach & Edelbrock, 1978; Quay, 1986).
