Over time, a considerable number of screening instruments have been developed to diagnose Internet addiction, including the Internet Addiction Test (IAT),[1] the Internet-Related Addictive Behavior Inventory (IRABI),[56] the Chinese Internet Addiction Inventory (CIAI),[57] the Korean Internet Addiction Self-Assessment Scale (KS Scale),[58] the Compulsive Internet Use Scale (CIUS),[59] the Generalized Problematic Internet Use Scale (GPIUS),[60] the Internet Consequences Scale (ICONS),[61] and the Problematic Internet Use Scale (PIUS).[62] Among others, the Internet Addiction Test (IAT) by Young (1998) exhibits good internal reliability and validity and has been used and validated worldwide as a screening instrument.[63][64][11]