Lexical proficiency in a second language (L2) has long been effectively assessed through the measurement of various lexical indices, or textual characteristics that act as observable indicators of such conceptual categories as lexical richness, diversity, sophistication, and fluency. While many studies have established links between these lexical…

In this final article in this guest-edited issue on synergies in second language acquisition and teaching (SLA/T), we attempt to bring together the main content of this issue in an overall, combined synergy statement, concluding this project as a whole. Let us remind readers of the project: A shared effort by 17 scholars taking 11 different…

The effects of learner- and task-related variables on second language (L2) writing syntactic complexity (SC) have been extensively investigated. However, previous research has rarely assessed the reliability of computational tools for analyzing the SC of L2 spoken production, and we know less about the effects of such variables on L2 speaking SC.…

Domestic immersion (DI) is an effective context for postsecondary language learning, given that DI's instructor-curated environments promote meaningful second language use while providing abundant support for learners. However, DI is at present understudied within second language acquisition research, especially when compared to its more…

Many scholars have identified teacher education (TE) as a crucial site for strengthening the research-practice interface. Much of this work has focused on formal TE opportunities, English-language instructors, or university-level contexts. Less is known about how other educator demographics engage with second language (L2) research throughout…

For many children in Flanders, Belgium, the language of instruction is not their first language. Allowing children to use their heritage languages in the classroom has been argued to have functional and socioemotional benefits. In two exploratory studies, we introduced a multilingual task in four classrooms across three linguistically and socially…

Language learners are often required to negotiate classroom participation in pair and group work; therefore, willingness to communicate (WTC) could be a key determiner of second language (L2) success. Classroom WTC is volatile and influenced by interlocutor-related variables, such as reciprocal identities, group membership and atmosphere, and peer…

Second language (L2) learners stand to gain substantially from mastering a wide range of multiword expressions (MWEs), and several studies have examined the benefits of language courses that regularly draw learners' attention to MWEs. However, most of these studies focused on the learners' retention of the MWEs included in the course materials and…

This complex article has six subsections. Following a brief introduction, one team of three co-authors and three single authors present compact statements of their distinctive individual research perspectives on second language acquisition and teaching (SLA/T): Atkinson, Mejía-Laguna, and Ribeiro offer a sociocognitive perspective; Cappellini…

Concept-based language instruction (C-BLI) is a pedagogy guided by sociocultural theory, which has been shown to be effective in facilitating second language learning. Typical activities include materialization by using a schema for a complete orienting basis of an action (SCOBA) and languaging, through which learners' internalization of…

As an international phenomenon, standardization has become increasingly prominent, and language has been curricularized through learning progressions, curricula, and high-stakes assessments. Curricularized systems exist in tension with what we know about how individuals develop language. As scholars have asserted, language development is mediated…

This article presents selected results from a large-scale, mixed-methods, federally funded investigation of US-based language study-abroad alumni of all ages, which included a nationwide survey (N = 4,899) followed by professional life history interviews with 54 participants. Here, we focus on three questions heretofore unaddressed: (a) How do…

Studies informed by poststructuralist theories of language have examined the relationship between language teachers' emotion labor, identity, and agency. However, research has not yet explored the relationship between emotion labor and volunteer teaching, which is an important practice in language education. Our research seeks to address this gap,…

In classrooms, teachers play a fundamental role in managing students' participation. As part of their classroom interactional competence to maximize interactional space for students' learning, teachers use multimodal resources to orchestrate turn-taking, allocate the next speaker, and manage repair sequences. However, little is known about how…

This article reports a teaching project for the purpose of improving the citation ability of second language (L2) graduate students in academic writing through concept-based language instruction (C-BLI). "Citation" here refers to writers' use of external sources in their own writing, which is an important and unique feature of academic…