Research has indicated that lexical richness is an important indicator of second language (L2) proficiency. However, most research has examined written, cross-sectional English L2 corpora and does not necessarily indicate how spoken lexical use develops over time or whether observed trends are stable across L2s. This study adds to previous…

This book gives an overview of the linguistic development of Korean-English bilingual children living in the US. It provides a detailed longitudinal account of English and Korean acquisition in early childhood, offering a close examination of Korean-American children's code-switching and morphology and syntax development during a time when their…

This longitudinal case study describes a male Korean English teacher's identity development during two years of compulsory military service. An "investment and imagined communities" framework undergirded the thematic analysis of emails, mobile messaging, and casual conversations. Three recursive themes emerged: English user, researcher,…

This true longitudinal study explored the lexical development of L2 university English major students in Thailand using two learner corpora. This study analyzed the natural learners' English language writing assignments from two writing courses and tracked their lexical development over a relatively long period (three years with five batches of…

This study investigated lexical complexity in English language teaching (ELT) students' essays across genres and over the course of time. The essays included descriptive, compare and contrast, advantage and disadvantage, and argumentative genres. Employing a longitudinal, quasi-experimental and repeated measures design in a year-long writing…

This study longitudinally examined the effects of cognitive and sociopsychological individual differences (aptitude, motivation, personality) and the quantity and quality of second language (L2) experience on L2 speech gains in naturalistic settings. We elicited L2 spontaneous speech from 50 Chinese learners of English at the beginning and the end…

Many second language (L2) learners participate in study abroad (SA) experiences believing their choice will be synonymous with increased interaction in the L2, from which enhanced linguistic gains will ensue. Nonetheless, one open question is whether SA participants actually engage in sustained L2 interaction while they are abroad. This paper…

This longitudinal case study investigated the developmental trajectories of two participants enrolled in an ITA oral communication course at Purdue University. The course provides language support to the ITA population who play a crucial role in higher education programs in the U.S. (Gorsuch, 2016). Over four months (i.e., one semester), I…

This study explores the lexical profile of essays written by 48 advanced learners of second language (L2) Russian who participated in the Russian Overseas Flagship, an intensive year-long study abroad program designed to help students reach Interagency Language Roundtable (ILR) Level 3 proficiency in all skills. Using the lexical frequency profile…

This article explores language learning as the speakers' microlongitudinal project in interaction. Using conversation analysis (CA) as a method, we present a single-case analysis on how a change occurs in the linguistic repertoire of 2 learners of Finnish. We discuss the challenges that the temporal aspect in learning poses within CA, such as the…

This study investigates the immediate and sustained effects of a pre-departure study abroad training on the oral production of L2 Chinese formulaic language across a range of social and transactional interactions. Eighteen upper-intermediate learners of Chinese were assigned to either an instructed or non-instructed group to determine the efficacy…

This investigation responds to the need for longitudinal data-driven research on additional-language (AL) acquisition by examining grammatical-gender marking among AL learners of French during a 21-month period, which included an academic year abroad (LANGSNAP corpus). The analysis of oral production consists of a generalized linear mixed model…

This longitudinal inductive research unpacks the process of African post-secondary students' Chinese language identity (CLI) with the purpose of exploring a model of CLI development. We traced how 12 multilingual African students developed their CLI during the first year in a Chinese university. Data coded from three rounds of interviews conducted…

Despite the growing body of studies on collocation learning in SLA research, there are hardly any studies taking the perspective of the individual learner or studies that have examined the effect of individual differences. This study--a qualitative component of a mixed-methods longitudinal project--presents an in-depth exploration of the intro-…

The Canadian Academic English Language (CAEL) assessment is a proficiency test for university admission. Most research has focused on the paper edition, not the recent computer edition (CE). Validity research on other proficiency tests found that relationships between proficiency scores and academic achievement measures can be tenuous because…