This article presents a theoretical review of and methodological guidelines for the study of two key notions in second language acquisition research, complexity and difficulty. The term "complexity" has gained considerable currency over the past decades and has taken on a wide range of meanings. We argue for a more restricted…

This study examined second language (L2) learning difficulty of 13 Chinese grammatical constructions on the basis of teachers' perceptions and associated the L2 learning difficulty of Chinese grammatical constructions with teacher-perceived learner grammatical competence and with the instructional levels. A total of 77 experienced teachers were…

This study examines the impact of authentic versus modified text on L2 Turkish learners' reading comprehension. A total of 230 B1-level Turkish language learners were randomly divided into two groups: one reading a modified text (n = 115) and the other an authentic text (n = 115). Both groups completed a surface-level reading comprehension test.…

The International English Language Testing System (IELTS) has served as one of the most reliable proofs of people's English language proficiency. There have been rumors about the discrepancy in difficulty between the two modules of IELTS, namely Academic (AC) and General Training (GT); however, there is little empirical evidence to confirm such a…

Second language (L2) writing researchers have enthusiastically adopted task complexity frameworks in their examination of the effects of complex task features on L2 written performance. However, such research often overlooks the effect(s) of such features on general L2 development as well as L2 writing development. Drawing from Manch?n and…

The present study is a partial replication of the most widely cited study of lexical coverage and reading comprehension by Hu and Nation (2000). Ninety-four advanced L2 learners read a short story at one of 90%, 95%, 98%, and 100% lexical coverage and then completed a 14-item reading comprehension test. The results showed that although…

Some learners of Chinese as a foreign language (CFL) face difficulties learning Chinese characters (hanzi), particularly if they are from alphabetic language backgrounds such as English. Many CFL students need to develop the ability to self-regulate their learning to cope with the learning of hundreds of characters in the beginner and intermediate…

Language learning is a complex issue of interest to linguists, computer scientists, and psychologists alike. While the different fields approach these questions at different levels of granularity, findings in one field profoundly affect how the others proceed. My dissertation examines the perceptual and linguistic generalizations regarding the…

Recent studies have shown that the frequency effect, although long used as a guide to word difficulty, fails to explain all variance in learner word knowledge. As such, a "more than frequency" conclusion has been offered to explain how lexical sophistication accounts for word difficulty. This study presents a multiple regression model of…

This study examined the relationship between complexity, accuracy and fluency (CAF), using longitudinal data. Conducted from the perspective of complex dynamic systems theory (CDST), this research adopted four CAF general measures to track the development of five Chinese undergraduates' English speech over a 15-week period. LOWESS graphs supported…

This article examines the determinants of Syrian refugee students' language comprehension difficulties in Lebanon, Türkiye and Australia, three host countries offering refugees different types of legal status (short-term, medium-term and long-term legal settlement). To understand the influence of legal status and its corresponding educational…

This article responds to calls for greater inclusivity in second language acquisition research and, more specifically, to calls to explore further the impact of first language literacy on second language oracy (e.g., Tarone et al., 2009). We conducted a partial replication of Foster and Skehan's (1996) influential study of task complexity,…

This study examined how linguistic complexity features contribute to second language (L2) processing effort by analyzing the Dutch English-L2 learners' eye movements from GECO and MECO, two eye-tracking corpora. Processing effort was operationalized as reading rate, mean fixation duration, regression rate, skipping rate, and mean saccade…

Recent research focusing on the sources of listening anxiety identified individual and external factors (IEF), listeners' control over input (LC), and perceived level of task difficulty (PTD) as the main causes of anxiety among L2 listeners. This correlational study aims to explore whether the sources of anxiety in L2 listening have a causal…

This study reviews the effect of comprehension and perceived text difficulty in promoting reading enjoyment and interest to read more among novice learners practicing extensive and pleasure reading. Sixty-seven college students in their first semester of Spanish were asked to read a children-like story picture book in Spanish and were then given…