Alcohol use disorder (AUD) is a heterogeneous disorder, meaning individuals with AUD differ in their clinical symptoms and in the biological and psychological factors that contribute to their disorder. A better understanding of individual differences in AUD could inform the development of tailored treatment approaches to increase treatment effectiveness. New research from the University of New Mexico, the University of Washington, and Syracuse University published in Psychology of Addictive Behaviors shows that assessing patients based on biological and psychological domains of addiction could be a good way to predict treatment outcomes.