Book excerpt: While the Internet is a relatively new technology, that has impacted the world, and provided many benefits, it has also had negative ramifications. Individuals unable to control their use are jeopardizing school, employment and relationships. The concept of “Internet Addiction” is used to explain uncontrollable, damaging use of technology. It is characterized as an impulse control disorder, comparable to pathological gambling, because of overlapping diagnostic criteria and symptomatology. Based on these studies, the IAT was constructed to capture the problematic behavior associated with compulsive use of technology, including online porn, internet gambling and compulsive use of online games and social media. The IAT-F is for children and adolescents and completed by an informant who knows the youth well. The IAT-F contains the Parent-Child Internet Addiction Test (PCIAT), a 20-item-questionnaire for adolescents, and theProblematic and Risky Media Use in Children Checklist, an 8-item-checklist for use with children. Both forms may be completed by a parent or other caregiver that knows the youth well. Clinical cut-off scores and severity of addiction qualifiers are provided. The PCIAT also helps identify which areas of functioning are most impaired, including: AttentionSocial BehaviorAggressive Behavior