There are three main subtypes in those suffering from ADHD. The first subtype is Attention-Deficit/Hyperactivity disorder, combined type. In this type at least six or more of the symptoms that fall under the inaction category must have persisted for at least 6 months along with at least six hyperactivity-impulsivity symptoms. For children this is the most common type(American Psychiatric Association., & American Psychiatric Association, 2000). Combined ADHD type is stll makes up the largest subcategory in adults though it decreaes while the predimantly inactive type increases. The second subtype is Attention-Deficit/Hyperactivity disorder, Predominantly Inactive type. Like the combined subtype at least six inaction symptoms must be present for 6 months. It is not required that that at least six hyperactive symptoms be present. A person classified as inactive subtype does not have to be calm may appear just as high strung as any of the other individuals (American Psychiatric Association., & American Psychiatric Association, 2000). Due to the nature of this subtype it is typically harder to spot individuals who may fall under this category.