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 study builds upon previous research investigating the construct validity of phraseological complexity as an index of L2 development and proficiency. Whereas previous studies have focused on cross-sectional comparisons of written productions across proficiency levels, the current study compares the "longitudinal" development of…

Motivational interactions during multiple language learning have been largely neglected in language motivation research. To fill this gap, we investigate longitudinal relations between Swiss German students' value beliefs in English, French, and German in upper secondary schools and whether there are differences in motivational development between…

Current models of the affinity between syntax and vocabulary are complex and recognize the contribution of bootstrapping and computational processes. To date, the mutual facilitation between these two constructs over time has not been studied in second language (L2) school children. The present study investigated longitudinally the direction and…

The current study examined cognitive effects of two pathways of second language (L2) acquisition longitudinally in Chinese speakers learning English in an L2-dominant environment. Thirty-nine participants who attended an intensive 10-week English course (L2-instruction group) were compared to 38 participants who attended regular university courses…

This exploratory study focuses on changes in the accomplishment of requests by an adult English as an additional language speaker/ learner interacting on WhatsApp for nine months. The analysis follows a microanalytic approach to digital interaction informed by recent developments within longitudinal conversation analysis. It unpacks the array of…

Research on assessing English as a foreign language (EFL) development has been growing recently. However, empirical evidence from longitudinal analyses based on substantial samples is still needed. In such settings, tests for measuring language development must meet high standards of test quality such as validity, reliability, and objectivity, as…

This study investigated the vocabulary development of children (N = 547) from linguistically and socioeconomically diverse classrooms in Germany from age 3 in preschool to age 7 in Grade 1. The results showed that for dual language learners (DLLs, n = 107) growth rates in their German majority language skills varied over classrooms. Compared to…

This longitudinal mixed-methods case study aimed to explain why a seemingly ordinary U.S.-affiliated hyper-connected French language learner (Nancy) achieved extraordinary outcomes after 15 weeks in Paris, compared to fifteen Generation Z peers also enrolled in the program. Framed by Complex Dynamic Systems Theory and social pedagogies, the study…

Previous studies suggest that age of acquisition affects the outcomes of learning, especially at the morphosyntactic level. Unknown is how syntactic development is affected by increased cognitive maturity and delayed language onset. The current paper studied the early syntactic development of adolescent first language learners by examining word…

This study examines the extent to which extra-linguistic factors such as language dominance, order of acquisition and language of instruction are deterministic for multilingual transfer selection and subsequent development. We test two groups of Catalan-Spanish bilinguals acquiring English as an L3 in a controlled setting. We first examine…

This longitudinal research presents case studies of three English as a foreign language (EFL) student teachers showing their development regarding target language (TL) use, taking into account both the amount of TL use and the classroom situations the TL is used in. Additionally, the factors that influence their TL use are discussed. The data…

In Geneva, Switzerland, students in secondary 1 education are grouped into different tracks according to their academic level. The tracking system in Geneva has been reformed recently. Prior to the reform, the tracks were very hierarchical but less selective; following the reform, the tracks are still very hierarchical but the entry criteria are…

This article reports the results of the first longitudinal study that systematically investigates the acquisition of verb agreement by hearing learners of a sign language. During a 2-year period, 14 novel learners of Sign Language of the Netherlands (NGT) with a spoken language background performed an elicitation task 15 times. Seven deaf native…

This manuscript-based dissertation is comprised of three interrelated longitudinal studies on Spanish language growth and deceleration and its impact on English language growth and English reading skills in bilingual children. Chapter 1 introduces the manuscript-based dissertation and provides the background on existing, longitudinal work of dual…