In this episode we talk to Dr Cassie Boness about the idea of ‘Alcohol Use Disorder’ (AUD) as a widely applied concept in the identification and treatment of alcohol problems. Alcohol Use Disorder is the basis for identifying an alcohol problem in the American Psychiatric Association’s DSM, but also used as a broader term for alcohol-related problems including by the UK’s National Institute for Health & Care Excellence (NICE). Cassie is a  Research Assistant Professor at the University of New Mexico's Center on Alcohol, Substance Use and Addictions (CASA) and a clinical psychologist.  We discuss the basis of Alcohol Use Disorder and some of the issues around such attempts to identify the very complex nature of alcohol use and problems. This includes discussion on Cassie and others work on developing a new framework to better identify AUD - the  The Etiologic, Theory-Based, Ontogenetic Hierarchical Framework of Alcohol Use Disorder.