In Chapter 1, we present an overview of Vygotsky’s cultural-historical activity theory (CHAT), including an explanation of how regulatory processes arise from the routine practices of social life. As part of this overview, we provide an explicit definition of cultural practices. To elaborate how a practice perspective is beneficial for understanding behavioral regulation, we describe how basic elements of an activity theoretic framework capture defining elements of a social practice. This framework offers a useful model for conceptualizing and observing how social practices come into existence and bring/create contextual resources that influence behavioral regulation. These resources are contextually embedded and include such elements as cultural tools, sign systems and symbols, goal-directed activities, and tasks. To better understand how regulatory processes emerge from participation in a community’s valued activities, we offer definitions of self-, other-, and co-regulation from a practice perspective.