This dissertation outlines three studies investigating linguistically diverse students' (including bilingual and monolingual students) language use and self-efficacy in writing. Bilingual students are those who speak a language other than English, including students with various levels of English proficiency and language experience. The first two…

Becoming one of six official United Nations languages, English proficiency has become a prominent requirement for students and professionals entering international education and/ or careers, as assessed through standardized English proficiency tests. English learners conducted varied procedures to pursue the minimum test score criteria, including…

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…

Most English language teachers around the world speak English as an additional language, and their level of English proficiency is often a matter of concern for them and their employers who associate higher levels of language proficiency with more effective teaching skills. To this end, several studies have examined the relationship between…

The 3D virtual worlds (3DVWs) were widely used for language learning in the past two decades. Although numerous research studies acknowledged the affordance, a full-scale investigation that discussed how they can be applied to language learning with substantial evidence of effect sizes were not presented. Thus, this analysis aimed to synthesize…

This meta-analysis aims at investigating the impact of English language teaching practices on language outcomes. The literature search yielded 90 meta-analyses that were published between January, 1995 and December, 2019. The current study analyzed 90 meta-analysis and these studies comprised 3496 studies, 7870 effect sizes and nearly 700,000…

The goal of this meta-analysis is to evaluate how instructional technology has impacted advanced second language (AL2) development. Although numerous metaanalyses have been conducted within the CALL literature over the past two decades, they primarily focus upon learning outcomes and related effect sizes. None focus on advanced learning per se.…

A meta-analysis was conducted to examine the construct validity of language aptitude by synthesizing the existing research that has been accumulated over the past five decades. The study aimed to provide a thorough understanding of the construct by aggregating the data reported in the primary research on its correlations with other individual…

Low language proficiency and problem behavior often co-occur, yet language deficits are likely to be overlooked in children with emotional and behavioral disorders (EBD). Random effects meta-analyses were conducted to determine prevalence and severity of the problem. Across 22 studies, participants included 1,171 children ages 5-13 with formally…