This study set out to investigate the relationship between L2 vocabulary knowledge (VK) and second-language (L2) reading/listening comprehension. More than 100 individual studies were included in this meta-analysis, which generated 276 effect sizes from a sample of almost 21,000 learners. The current meta-analysis had several major findings.…

Researchers have agreed that language anxiety is situation-specific; however, whether existing instruments measure stable or transient components of this anxiety remains controversial. Therefore, this study examined language anxiety's trait stability and state variability. The results from synthesizing 21 test-retest correlations based on existing…

The present meta-analysis aimed to improve on Involvement Load Hypothesis (ILH) by incorporating it into a broader framework that predicts incidental vocabulary learning. Studies testing the ILH were systematically collected and 42 studies meeting our inclusion criteria were analyzed. The model-selection approach was used to determine the optimal…

Glossing is a widely used and examined vocabulary learning tool, and one of the major branches of glossing research has compared the relative effects of first language (L1) and second language (L2) glosses on reading comprehension and vocabulary learning. However, the findings in this literature have not been consistent, calling for a…

Nowadays, hardly anyone working in the field of foreign language teaching and learning can imagine life without machine translation (MT) tools. Thanks to the rapid development of artificial intelligence, MT now most widely assumes a new form, the so-called Neural Machine Translation (NMT), which offers the potential for a wide application in…

To address the evidence gap in making effective language of instruction (LOI) decisions, we propose a systematic review of the role of LOI choices in education programs and policies on literacy outcomes in multilingual educational contexts in low- and middle-income countries (LMICs). Grounded in a multidisciplinary theory of change (ToC)…

This study set out to re-examine the effectiveness of study abroad programs in second language (L2) acquisition through a multi-level meta-analysis. Overall, 42 primary studies published between 1995 and 2019 were identified, and in total 283 effect sizes were meta-analysed. This study implemented a three-level random effects model to account for…

The present dissertation is a synthesis and meta-analysis of the 15-year-old research domain of the L2 Motivational Self System (L2MSS) model initiated by Dornyei (2005). The study is based on data from 100 studies involving 144 unique samples and 51,905 participants, and it addresses the inter-relationships of L2MSS elements (i.e., the Ideal L2…

Extensive reading is an approach to language learning that encourages learners to read a large quantity of easy reading material. A substantial body of research confirms the effectiveness of this approach for developing proficiency in both first (L1) and second (L2) languages. This paper explains what extensive reading is, why it is important, and…

In the last 19 years (2003-2021), research on genre-based approaches (GBAs) to writing pedagogy has been accumulating in the fields of English as a second language (ESL) and English as a foreign language (EFL). This review mapped existing literature to identify research trends and provide a research agenda for future GBAs. This study employed the…

This study synthesised previous literature focused on college English for Academic Purposes (EAP) programmes for writing. A meta-analysis of identified longitudinal studies (14 samples; 175 effect sizes; N = 602) revealed that the students improved their English writing through EAP programmes (d = 0.45, SE = 0.07, p < 0.001). By computing…

Pragmatic instruction has received momentous attention in Second Language Acquisition (SLA) over the last decades. In order to scrutinize the effectiveness of L2 instruction, meta-analyses are warranted; nonetheless, meta-analyses have been largely neglected, despite the fact that they provide a systematic explanation of the findings from the…

Ongoing debate exists concerning pedagogical strategies including song to improve vocabulary learning in second or foreign language learners. A search of primary empirical studies published from 1990 to 2020 produced 27 articles with 28 studies and 1864 total participants. Effect sizes were analysed for the influence of English instructional…

Studies examining the positive emotion of foreign language enjoyment (FLE) have recently increased exponentially, as researchers are applying the tenets of positive psychology in applied linguistics. It is therefore an appropriate time to take stock of the current literature and conduct a preliminary meta-analysis. The relationships between FLE…

This three-article format dissertation aims to provide evidence of the effect size of the relationship between writing self-efficacy and writing achievement in an empirical study and a meta-analysis, and compare three methods, the averaging method, three-level meta-analysis (3LM), and robust variance estimation (RVE), in handling multiple…