Causal inference is a fundamental goal of many research endeavors, including scholarship in the field of language education and learning. Randomized controlled trials are considered an ideal design to test causal claims, but not all claims can be subjected to experimental treatment due to ethical and practical constraints. In this article, we…

Purpose: This meta-analysis study aimed to determine the optimal level of talker variability in training to maximize second-language speech learning. Method: We conducted a systematic search for studies comparing different levels of talker variability in nonnative speech training, published through July 2024. Two independent reviewers screened…

An important issue in second-language acquisition concerns the role of explicit information (EI) and how it is affected by individual differences. The present study explored this question through a partial replication and extension of Fernández (2008: Experiment 2), which investigated the effects of EI in processing instruction (PI) for the…

Drawing on Markus and Nurius's (1986) theory of possible selves and Higgins's (1987) theory of self-discrepancies, Dörnyei (2005, 2009) developed the L2 self-guide, a construct explaining the generation of motivation for language learning. Because Dörnyei focused on convergences in the source theories, L2MSS researchers have come to regard…

In this paper, we report a longitudinal study of the effects of procedural task repetition on learners' task performance (i.e., syntactic complexity in relation to lexical complexity). We investigated how task repetition results in differences at the group and individual level across each task interval (T = 7). Intermediate-level Saudi learners of…

A growing body of evidence demonstrates that individual differences in declarative memory may be an important predictor of second language (L2) abilities. However, the evidence comes from studies using different declarative memory tasks that vary in their reliance on verbal abilities and task demands, which preclude estimating the size of the…

Research into second language acquisition (SLA) has shown that individual difference (ID) variables can be strong predictors of language achievement (e.g., Dornyei, 2003; Skehan, 2003). Traditionally, this research conceptualized ID variables as static and monolithic variables (e.g., Dornyei, 2010). More recently scholars have questioned this…

In this article, we highlight the important achievements of the editors and contributors in this special issue. We argue that this collection of studies on individual differences (IDs) advances the field in terms of theoretical diversification, methodological improvement, and pedagogical innovation. We also contend that a renewed interest in ID…

There is a need for a continued focus on language learning in advanced language classes beyond the foundations that are formed in the beginning and intermediate levels. Despite this need, little work exists on how to implement language-focused instruction in upper-level courses. As one possible solution, this paper outlines a functional,…

This study is the first to investigate subject-level variability in sociolinguistic evaluative judgements by 30 adult L2 German learners and explore whether the observed variability is characterizable as a function of individual differences in proficiency, exposure, and motivation. Because group-level estimates did not paint an accurate picture of…

This article reports a qualitative case study on the translanguaging practices of Vietnamese English-as-a-foreign-language (EFL) educators and explores the mechanisms behind individual differences in their practices through an integrative cultural-historical activity theory perspective. Data were collected through semi-structured interviews,…

The aim of the present article is to provide a systematic review of qualitative studies in the leading journals of our field focusing on their distributional properties in the various journals as well as topic choice and selected quality control issues. In order to achieve this aim, we carried out a systematic review of research articles published…

The purpose of this article is to offer a narrative review of research on effective language learning environments for learners in the digital era. To do this, a search strategy was employed to retrieve both conceptual analyses and empirical studies, initially including whether published as journal articles or book chapters. The collected data…

Recent research on second or additional language (L2) pragmatics instruction in study abroad has incorporated the technique of encouraging students to gather data about pragmatics, for example, by asking members of the host country to complete questionnaires, practice using pragmatic features, or answer questions about pragmatics (e.g., Hernández,…

Whether or not to teach grammar explicitly is an issue that has long been debated in the field of SLA. There seems to be a growing consensus among many researchers now in support of embedding some element of explicit instruction within a communicative curriculum. The main arguments in support of explicit instruction are threefold: two widely cited…