Relationship between Task Complexity and Learner Factors: An Analysis of Intermediate and Advanced Learners of Korean Language

Sunjin Lee1, Eunjin Gye2, Juno Baik3,
Author Information & Copyright
1The Academy of Korean Studies
2Kyung Hee University
3Brigham Young University
Corresponding Author: Assistant Professor Department of Asian and Near Eastern Languages Brigham Young University 3089 JFSB, Brigham Young University, Provo, UT 84602, USA E-mail:

ⓒ Copyright 2024 Language Education Institute, Seoul National University. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Feb 29, 2024 ; Revised: Apr 07, 2024 ; Accepted: Apr 14, 2024

Published Online: Apr 30, 2024


This study investigated the impact of learner factors on complexity, accuracy, and fluency (CAF) when performing tasks with varying levels of complexity. The study measured working memory, language anxiety, and the scale and intensity of social interaction among 25 intermediate and 30 advanced Korean learners, as well as native Korean speakers. The results showed that the complexity of spoken language production increased with more complex tasks at the expense of accuracy, particularly among second-language learners. Conversely, native speakers maintained consistent accuracy across different task types. These findings underscore the importance of tailoring task design and implementation to individual learner profiles, which is essential for optimizing task-based language-learning environments. This study advocates a balanced approach that aligns task demands with learner needs to enhance educational outcomes.

Keywords: task complexity; working memory; language anxiety; social interaction; CAF



Afshar, H. S., & Tofighi, S. (2021). The role of task complexity and working memory capacity in L2 accuracy and fluency. Journal of English Language Teaching and Learning, 13(27), 389-416.


Awwad, A., & Tavakoli. P. (2022). Task complexity, language proficiency and working memory: Interaction effects on second language speech performance. International Review of Applied Linguistics in Language Teaching, 60(2), 169-196.


Baik, J. (2014). The relationship between Korean proficiency and working memory (Ph.D. theis). Kyung Hee University, South Korea.


Baker-Smemoe, W., Dewey, D. P., Bown, J., & Martinsen, R. A. (2014). Variables affecting L2 gains during study abroad. Foreign Language Annals, 47(3), 464-486.


Bataller, R. (2010). Making a request for a service in Spanish: Pragmatic development in the study abroad setting. Foreign Language Annals, 43(1), 160-175.


Cho, A. Y., & Kim, Y. J. (2023). Aspects of spoken language production of Korean learners according to task complexity. Language Facts and Perspectives, 60, 131-163.


Dewey, D. P., Bown, J., & Eggett, D. (2012). Japanese language proficiency, social networking, a study abroad: Learners' perspectives. Canadian Modern Language Review, 68(2), 111-137.


Dewey, D. P., Belnap, R. K., & Hillstrom, R. (2013). Social network development, language use, and language acquisition during study abroad: Arabic language learners' perspectives. Frontiers: The Interdisciplinary Journal of Study Abroad, 22(1), 84-110.


Du, H. (2013). The development of Chinese fluency during study abroad in China, The Modern Language Journal, 97(1),131-143.


Ellis, R. (2003). Task-based language learning and teaching, Oxford: Oxford University Press.


Foster, P., & Skehan, P. (1996). The influence of planning and task type on second language performance. Studies in Second Language Acquisition, 18(3), 299-324.


Hernández, T. A. (2010). Promoting speaking proficiency through motivation and interaction: The study abroad and classroom learning contexts. Foreign Language Annals, 43(4), 650-670.


Hyun, J. E., & Lee, J. H. (2018). The effects of task complexity and working memory on Korean adult learners' English speaking performance. English Teaching, 73(1), 115-134.


Isabelli-García, C. (2006). Study abroad social networks, motivation and attitudes: Implications for second language acquisition. In E. Churchill, & M. DuFon (Eds.), Language learners in study abroad contexts (pp. 231-258), Bristol: Multilingual Matters.


Ishikawa, T. (2006). The effects of task complexity and language proficiency on task-based language performance. The Journal of Asia TEFL, 3(4), 193-225.


Ishikawa, T. (2011). Examining the influence of intentional reasoning demands on learner perceptions of task difficulty and L2 monologic speech. In P. Robinson (Eds.), Second language task complexity: Researching the cognition hypothesis of language learning and performance (pp. 307-330), Amsterdam: John Benjamins.


Kim, M. S. (2020). A study on the effect of task complexity performing language competency by Korean learners (Ph.D. theis). Sookmyung Women's University, South Korea.


Kim, Y. J., & Tracy-Ventura, N. (2011). Task complexity, language anxiety, and the development of the simple past. In P. Robinson (Eds.), Second language task complexity: Researching the cognition hypothesis of language learning and performance (pp. 287-306), Amsterdam: John Benjamins.


Kormos, J., & Trebits, A. (2011). Working memory capacity and narrative task performance, In P. Robinson (Eds.), Second language task complexity: Researching the cognition hypothesis of language learning and performance (pp. 267-286), Amsterdam: John Benjamins.


Lee, J. E. (2012). Effects of task complexity and task familiarity on complexity, accuracy and fluency of oral production in L2 Korean (MS dissertation). Kyung Hee University, South Korea.


Lee, S. J., Gye, E., & Baik, J. (2023). A study on task complexity and learners' cognitive factors - Focusing on the complexity, accuracy, and fluency of advanced Korean language learners. Korean Education, 134, 133-169.


Llanes, À., Tragant, E., & Serrano, R. (2012). The role of individual differences in a study abroad experience: The case of Erasmus students. International Journal of Multilingualism, 9(3), 318-342.


MacIntyre, P. D., & Gardner, R. C. (1994). The subtle effects of language anxiety on cognitive processing in the second language. Language Learning, 44, 283-305.


Malicka, A. (2014). The role of task complexity and task sequencing in L2 monologic oral production (Ph.D. theis). Universitat de Barcelona, Spain.


Nam, K. S., & Ko, Y. K. (1985), Pyojungugeomunbeopron (The Standard Korean Grammar), Seoul: Top Publishing.


Révész, A. (2011). Task complexity, focus on L2 constructions, and individual differences: A classroom-based study. Modern Language Journal, 95(s1), 162-181.


Robinson, P. (2001). Task complexity, task difficulty and task production: Exploring interactions in a componential framework. Applied Linguistics, 22(1), 27-57.


Robinson, P. (2006). Criteria for classifying and sequencing pedagogic tasks, In M. P. Garcia, & M. P. Mayo (Ed.), Investigating tasks in formal language learning (pp. 7-27), Bristol: Multilingual Matters.


Robinson, P. (2007). Task complexity, theory of mind, and intentional reasoning: Effects on L2 speech production, interaction, uptake and perceptions of task difficulty. International Review of Applied Linguistics in Language Teaching, 45(3), 193-213.


Robinson, P. (2011). Task-based language learning: A review of issues. Language Learning, 61(s1), 1-36.


Robinson, P., & Gilabert, R. (2007). Task complexity, the cognition hypothesis and second language learning and performance. International Review of Applied Linguistics in Language Teaching, 45(3), 161-176.


Segalowitz, N., & Freed, B. F. (2004). Context, contact and cognition in oral fluency acquisition: Learning Spanish in at home and study abroad contexts. Studies in second Language Acquisition, 26(2), 173-199.


Skehan, P., & Foster, P. (2001). Cognition and tasks, In P. Robinson (Ed.), Cognition and second language instruction (pp. 183-205), Cambridge: Cambridge University Press.


Song, G. M. (2023). A study on the effects of task characteristics on the oral production of learners of Korean (MS dissertation), Seoul National University, South Korea.


Trebits, A. (2016). Sources of individual differences in L2 narrative production: The contribution of input, processing, and output anxiety. Applied Linguistics, 37(2), 155-174.


Won, M. J., Hwang, J. Y., Nam, M. J., Wang, E. M., Wang, H., Lee, S. J., Kim, J. Y., Joo, J. J., Joo, W. D., Kim, J. Y., Shin, H. R., & Park, J. H. (2019). Hangugeo hagseubja eoneo jalyo bunseogui bangbeobgwa silje (The method and practice of analysis on language materials for Korean learners), Seoul: Hangugmunhwasa.


Zalbidea, J. (2017). 'One task fits all'? The roles of task complexity, modality, and working memory capacity in L2 performance. The Modern Language Journal, 101(2), 335-352.