Behavior modification is a technique used for altering an individual's behavior and is based on the principles of learning theory. Using this technique, a behavior can be modified with respect to its frequency, duration, or intensity. Behavior modification is a comprehensive approach that can be applied to behaviors that occur too often (e.g., behavioral excesses), too infrequently (e.g., behavioral deficits), and with behaviors that are both observable (e.g., overt) and those that are not directly evident (e.g., covert). Interventions using behavior modification have produced positive results when delivered to individuals diagnosed with anxiety disorders, attention deficit hyperactivity disorder (ADHD), behavioral and emotional disabilities, and developmental disabilities.