Despite the range of varieties of Han Chinese, Mandarin is the most widely studied variety in research on Chinese as a heritage language (CHL) around the world. To better understand the role of other varieties of Han Chinese in addition to Mandarin, this article presents a synthesis of research on the learning of Chinese varieties in formal and…

This paper reports a bibliometric analysis of two small data sets: a set of 34 papers that make up "The Routledge handbook of vocabulary studies" (Webb, 2020) and a set of papers dealing with second language (L2) vocabulary research taken from a single journal "Frontiers in Psychology." Bibliometric maps based on author…

Complex Dynamic Systems Theory (CDST), an instantiation in applied linguistics of complexity epistemology that transcends disciplinary boundaries, has gained much traction and momentum over the last decade, finding expressions in a fast-growing number of empirical second language developmental studies. However, the literature, while rapidly…

The Common European Framework of Reference (CEFR) is a crucial reference framework for informing teaching, learning and assessment that has achieved worldwide prominence in language education. However, there have been concerns raised regarding the breadth of its influence across different domains and countries. Using a bibliometric approach, a…

Nowadays, research in second language acquisition (SLA) is becoming increasingly interdisciplinary while many technical frontiers and research hotspots have emerged. Many studies focus on interdisciplinary topics, but few in-depth studies have been conducted on interdisciplinarity. This study examined the interdisciplinarity of SLA and the…

Structural equation modeling (SEM), as a flexible and versatile multivariate statistical technique, has been growingly used since its introduction in the 1970s. This article presents a methodological synthesis of the characteristics of the use of SEM in L2 research by examining the reporting practices in light of the current SEM literature to…

In this brief report, we present a scoping review of 31 second language (L2) vocabulary research syntheses published in the Web of Science from January 1990 to May 2022. The purpose of this undertaking was to understand what L2 vocabulary research synthesizers have aggregated and the investigative foci they intended to address. It was observed…

We present a review of second language researchers' use of cluster analysis, an advanced statistical method still uncommon but increasingly used to identify groups or patterns in a dataset and to examine group differences. After describing key methodological considerations in conducting cluster analysis, we present a methodological synthesis of 65…

This meta-analysis synthesized 35 English studies (130 effect sizes, N = 1,981) that employed online tasks to investigate the processing of multiword sequences (MWSs). We examined (a) to what extent MWSs enjoy a processing advantage over novel word combinations; (b) how such a processing advantage is moderated by statistical regularities (i.e.,…

Increased second language acquisition (SLA) research interest in the effect of planning on subsequent L2 oral production has typically examined the effect of planning on the syntactic complexity, accuracy, lexical complexity, and/or fluency (CALF) of L2 production. However, the results of research in this domain are inconclusive. This study, a…

The importance of academic journals in second language (L2) research is evident on at least two levels. Journals are, first of all, central to the process of disseminating scientific findings. Journals are also critical on a professional level as most L2 researchers must publish articles to advance their careers. However, not all journals are…

Besides explicit inference of word meanings, associating words with diverse contexts may be a key mechanism underlying vocabulary learning through reading. Drawing from distributional semantic theory, we developed a text modification method called reflash to facilitate both word-context association and explicit inference. Using a set of left and…

This systematic review synthesizes recent trends in English for Specific Purposes (ESP) research, examining 149 empirical studies published in Social Sciences Citation Index (SSCI) journals between 2014 and 2023. Employing a six-dimensional coding framework, we investigated participants, pedagogical methods, research methods, research foci,…

Statistical tests carry with them a number of assumptions that must be checked. Failing to do so and to report the results of such preliminary analyses introduce a potential threat to the internal validity of a study and to our ability as consumers to put faith in study findings. This article systematically examines the reporting of checks on…

The study of language maintenance and shift (LMS) has attracted a large body of empirical work in language policy and planning (LPP) contexts, including allochthonous (immigrant) and autochthonous (indigenous) languages. However, some critical ontological questions that relate to the scope and terminology of language maintenance studies remain…