This article begins with a brief description of the guiding theory behind cognitive-behavioral interventions with youth, such as a therapeutic posture, an important cognitive distinction, and a specific treatment goal. Next, on the basis of a review of the literature, the nature of cognitive functioning, the treatments, and the outcome of treatment studies are described and examined for (a) aggression, (b) anxiety, (c) depression, and (d) attention-deficit hyperactivity. Conclusions and emerging developments are provided. Central to a successful completion of childhood is the child's development of a confident sense of mastery, of appropriate social behavior, and of an ability to engage in self-control. As children enter and pass through school and become more independently involved in social relationships, there is a new emphasis toward carrying through on activities and accomplishing goals. The child must work to strike a balance between compliance with adult rules and the assertion of independent competence. Industrious work in school and social interactions are the testing ground for children to compare themselves with others, to gain a sense of self, and to acquire the skills needed to adjust to the demands of the environment. Adjusting and coping with these developmental challenges can be a struggle for children, and not all manage the task successfully. Indeed, current estimates of the amount of psychopathology in children in the United States are alarming. Recent epidemiological data suggest that between 15% and 22% of the nation's approximately 63 million youth have mental health problems severe enough to warrant treatment (Costello, 1990; National Advisory Mental Health Council, 1990). Yet, as Tuma (1989) noted, of those in need of mental health care, less than 20% received the appropriate services. These data are probably representative of a concern that is worldwide. Indeed, psychological maladjustment in youth is a major problem confronting today's society. All children face developmental challenges, yet not all of these children are prepared, and not all of the challenges are met. Thus, the issue facing clinical child psychology is how to best intervene to reduce or remediate the cognitive, behavioral, and emotional difficulties in childhood that are associated with present psychological distress and later psychopathology. Guiding Theory Those involved in designing interventions for youth have approached their task from various perspectives. Some have