Oppositional Defiant Disorder (ODD) Assessment View Calculator Oppositional Defiant Disorder (ODD) is when a child develops a pattern of disobedient, hostile, and defiant behavior toward authority figures. All children are oppositional from time to time (particularly when tired, hungry, stressed or upset) and they will argue, talk back, disobey, and defy parents, teachers, and other adults. These behaviors are a normal part of development for very young children, but parents generally notice symptoms of ODD by age 8 when the behaviors have not improved. By about age 8, the openly uncooperative and hostile behavior may be ODD when it is so frequent and extreme when compared with other children of the same age and when it affects the child's social, family, and school life. The causes of ODD are unknown, but many parents report that their child with ODD was more rigid and demanding from an early age than the child's siblings. Experts believe biological and environmental factors may have a role. Take this quick assessment to learn the signs of Oppositional Defiant Disorder and help you determine if your child may have ODD. Learn more about putting this calculator or other calculators on your website.