Drinking vessels provide information on changes in drinking practices, crafting, exchange patterns, rituals, and the creation of status differences in Chacoan society. They reveal a gradual sequence of change in vessel forms, followed by dramatic intensification of drinking activity in the AD 1000s that provided opportunities for differentiation among Chaco residents, particularly at Pueblo Bonito. Termination of the most iconic drinking vessel form, the cylinder vessel, and the rituals surrounding it around AD 1100 was followed by the introduction of a northern drinking vessel form. Careful reconstruction of the production, consumption, and discard practices associated with drinking vessels provides the means for understanding broader processes in the Chaco world.