Two broad dimensions of behavior disorders are...
1. Externalizing behavior disorders: This dimension includes behavior disorders that are characterized by behaviors that are disruptive, aggressive, and noncompliant. Examples of externalizing behavior disorders include oppositional defiant disorder, conduct disorder, and ADHD.
2. Internalizing behavior disorders: This dimension includes behavior disorders that are characterized by behaviors that are internalized and often not outwardly visible. These behaviors may include anxiety, depression, social withdrawal, and feelings of inadequacy. Examples of internalizing behavior disorders include anxiety disorders, depression, and PTSD.