Understanding language teachers’ mental lives (Walberg, 1972), and how these shape and are shaped by the activity of language teaching in diverse sociocultural contexts, has been at the forefront of the sub discipline of applied linguistics that has become known as language teacher cognition. Although the collective research efforts within this domain have contributed critical insights into what language teachers know, believe, and think in relation to their work (cf. Borg, 2006), limited progress has been achieved in addressing some of the most pertinent questions asked by applied linguists, policy makers, and the general public alike: How do language teachers create meaningful learning environments for their students? How can teacher education and continuing professional development facilitate such learning in language teachers? By revisiting the domain's epistemological, conceptual, and ethical foundations, this special issue sets an agenda for reinvigorated inquiry into language teacher cognition that aims to redraw its current boundaries and thus reclaim its relevance to the wider domain of applied linguistics and to the real‐world concerns of language teachers, language teacher educators, and language learners around the world.

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This article lays out the proposition that the rapid changes in 21st‐century society, in which multilingualism is the norm, have presented new challenges, questions, and resources with regard to the roles, tasks, and contributions of language teachers. In line with recent research developments and in keeping with tradition, we believe it helpful to think of language teachers’ broader identity role as that of moral agent. We examine implications that such a re‐envisioning has for the knowledge base of language teachers and for the purposes and practices of language teacher education and professional development. Drawing on research in language teacher education, language teacher cognition, second language acquisition, and applied linguistics more broadly, we highlight the need to go beyond traditional notions of teachers’ knowledge of language, language learning, and language learners. We also subject to critical scrutiny the notions of effective pedagogies and reflective practice as the desired outcomes of language teacher preparation and development. Instead, we introduce critical alternatives that offer creative possibilities for educating teachers able and willing to serve student populations with diverse language learning needs across interlinguistic, sociopolitical, and historical contexts of language teaching.

The prominent current tendency in applied linguistics to situate its theory and research has seen parallel shifts in the type of research methodologies being employed. Increasingly, decontextualized laboratory methodologies are giving way to more holistic approaches, and these, in turn, involve a significant shift in the researchers' roles, relationships, and ethical responsibilities. By providing examples of specific ethical dilemmas that arose in the process of a longitudinal classroom‐based research project, I aim to illustrate that adherence to general “macroethical” principles established in professional codes of ethics may be inadequate for ensuring ethical research in the situated era, which warrants the expansion of the ethical lenses and consideration of alternative microethical models. I conclude with a call for developing a more contextualized code of practice that would integrate both perspectives and recognize the ability to reflect on the ethical consequences of research practice as a core competence of applied linguists.

Understanding the relationship between teachers' use of language in teacher-led discourse (TLD; Toth, 2008) and opportunities for L2 development is a well-established area of SLA research. This study examines one teacher's role in creating such opportunities in TLD in her EFL classes in a state secondary school by examining the inner resources that informed her interactional practices. The database comprises audiorecordings of TLD from eight lessons, pre-and post-observation interviews, ethnographic field notes from multiple school visits, and repeated ethnographic interviews with the teacher. The results from a close analysis of TLD and a grounded theory analysis of the ethnographic data show that the teacher's future self guides, conceptualized as language teachers' possible selves (Kubanyiova, 2009), had a critical influence on how she navigated classroom interaction and the L2 development opportunities that arose as a result. The findings offer new insights into the types of professional development opportunities needed to transform teachers' discourse. By bridging two domains of inquiry-SLA and language teacher cognition-in a single study, this article sets a new research agenda in applied linguistics and responds to calls for increasing its relevance to the real world (Bygate, 2005;Ortega, 2012a).Keywords: teacher-led discourse; L2 development opportunities; language teacher cognition; future self guides STUDYING THE RELATIONSHIP BETWEEN classroom interaction and opportunities for second/foreign language (L2) development constitutes one of the central activities of second language acquisition (SLA) research (