This book proposes a community systems dynamic perspective to provide a paradigm for understanding and ultimate prevention of alcohol-related problems, such as medical complications and social consequences (divorce and job loss, for example). The community systems model of alcohol use and its resulting medical and social consequences contains six elements or subsystems: 1) community alcohol consumption that influences and in turn is influenced by 2) social, economic, and health consequences to the individual and 3) community legal sanctions. Further influences on alcohol consumption are 4) social norms for drinking behavior, 5) formal state and local laws controlling accessibility of alcohol, and 6) retail alcohol sales. Relations among these factors are often two-way, as for example between consumption and social norms, a relationship that is being scrutinized today in discussions about so-called binge drinking (defined as five or more drinks at a single setting). In addition to these six community factors and their interrelationships, there are two exogenous factors that are postulated to influence consumption—economic trends and changes in population.