This document discusses three eras in applied linguistics research methodologies: the invisible learner era, the learner-centered era, and the person-centered era. It summarizes how approaches have shifted from a focus on linguistics and classroom teaching, to scrutinizing individual learners as abstract variables, to emphasizing learners' social contexts, agency, and identities. The social turn in applied linguistics recognizes language learning as embedded in intricate social interactions, involving learners' personal backgrounds and motivations within wider social networks. The document also questions whether critiques of individualism have gone too far and discusses relationships between theory and methodology.