Second language acquisition (SLA) research informed by sociocultural theory (henceforth, SCT) began in earnest with the publication of Frawley & Lantolf's (1985) article on L2 (second language) discourse (described in the timeline proper). Since then, well over 300 journal articles, book chapters and doctoral dissertations have appeared in the research literature. Although the term ‘sociocultural’ is often applied to a wide array of approaches to research that seeks to understand what it means to be a human being, in the present timeline, we restrict its interpretation to refer to the specific theory of psychological development proposed by Vygotsky (1986). Other approaches that have appropriated the term, such as those emanating from the writings of Bakhtin (1981), while compatible in many respects with Vygotskian theory, have a different focus and are not strictly speaking psychological or psycholinguistic theories. To be sure, Vygotsky rarely used the term ‘sociocultural’, preferring instead ‘cultural psychology’ or ‘cultural-historical psychology’ to refer to his theory. Wertsch (1985) is generally credited with having coined the term ‘sociocultural’ as a way of capturing the notion that human mental functioning results from participation in, and appropriation of, the forms of cultural mediation integrated into social activities.