Anxiety disorders are among the most common disorders in children. Although anxiety is a normal part of growing up, the worrying experienced by children with anxiety disorders can persist to the point that day-to-day functioning becomes difficult. Physical symptoms of anxiety disorders include a constant sense of worry or stress, headache, nausea, sweating, shaking, and inability to concentrate. Early identification of anxiety disorders is important to prevent progression of the disorder into a chronic issue. Cognitive behavioral therapy (CBT), which focuses on behavioral and thinking modifications, has been shown to be the most effective treatment for anxiety disorders. This study will evaluate the effectiveness of school-based CBT with or without parental involvement in treating anxious children who meet DSM-IV criteria or have features of separation anxiety disorder, generalized anxiety disorder, and social phobia.