Content and language integrated learning (CLIL) is a major area of interest within the field of formal education. There are numerous studies presenting data and results of CLIL implementation. The positive impacts have been reported in building positive attitudes to language learning, to content subject learning, increasing efficacy of language learning. Questions have been raised about the factors that (may) affect research results and their interpretation. Many small studies bring statistically non-significant data as they use small convenience samples. Meta-analyses enable the researchers to synthesise data from research with the same characteristics. The present article analyses the studies that focus on CLIL implementation at primary and secondary schools with special focus on receptive skills and vocabulary gains. Out of 385 selected studies were 9 included and applying randomised-effect model evaluated. The analysis found no statistically significant differences between the CLIL and EFL groups in listening and reading performance. Concerning vocabulary the statistically significant difference in favour of CLIL (p<0,0001) with overall estimate effect 0,84 and confidence interval ranging from 0,56 to 1,11 was observed.
Agudo, J. D. (2019). Which instructional programme (EFL or CLIL) results in better oral communicative competence? Updated empirical evidence from a monolingual context. Linguistics and Education, 51, 69-78. doi:10.1016/j.linged.2019.04.008
Agustín-Llach, M. P., & Canga Alonso, A. (2014). Vocabulary growth in young CLIL and traditional EFL learners: Evidence from research and implications for education. International Journal of Applied Linguistics, 26(2), 211-227. doi:10.1111/ijal.12090
Borenstein, M., Hedges, L. V., Higgins, J. P., & Rothstein, H. R. (2009). Introduction meta-analysis. Chichester: John Wiley & Sons.
Bruton, A. (2011). Is CLIL so beneficial, or just selective? Re-evaluating some of the research. System, 39(4), 523-532. doi:10.1016/j.system.2011.08.002
Canga Alonso, A. (2013). The receptive vocabulary of Spanish 6th-grade primary-school students in CLIL instruction: A preliminary study. Latin American Journal of Content and Language Integrated Learning, 6(2), 22-41. doi:10.5294/laclil.2013.6.2.2
Castellano-Risco, I., Alejo-González, R., & Piquer-Píriz, A. M. (2020). The development of receptive vocabulary in CLIL vs EFL: Is the learning context the main variable? System, 91, 102263. doi:10.1016/j.system.2020.102263
Castro-García, D. (2017). Receptive vocabulary measures for EFL Costa Rican high school students. International Journal of English Studies, 17(2), 81-99. doi:10.6018/ijes/2017/2/265681
Cenoz, J. (2015). Content-based instruction and content and language integrated learning: The same or different? Language, Culture and Curriculum, 28(1), 8-24. doi:10.1080/07908318.2014.1000922
Chostelidou, D., & Griva, E. (2014). Measuring the Effect of Implementing CLIL in Higher Education: An Experimental Research Project. Procedia - Social and Behavioral Sciences, 116, 2169-2174. doi:10.1016/j.sbspro.2014.01.538
Coyle, D., Hood, P., & Marsh, D. (2010). CLIL: Content and language integrated learning. Cambridge, UK: Cambridge University Press.
Dallinger, S., Jonkmann, K., Hollm, J., & Fiege, C. (2016). The effect of content and language integrated learning on students’ English and history competences – Killing two birds with one stone? Learning and Instruction, 41, 23-31. doi:10.1016/j.learninstruc.2015.09.003
European Commission/EACEA/Eurydice. (2017). Key Data on Teaching Languages at School in Europe – 2017 Edition. Eurydice Report. Luxembourg: Publications Office of the European Union. doi:10.2797/839825
Fontecha, A. F., & Canga Alonso, A. (2014). A preliminary study on motivation and gender in CLIC and non-CLIL types of instruction. International Journal of English Studies, 14(1), 21-36. doi:10.6018/ijes/14/1/156681
Gené-Gil, M., Juan-Garau, M., & Salazar-Noguera, J. (2015). Development of EFL writing over three years in secondary education: CLIL and non-CLIL settings. The Language Learning Journal, 43(3), 286-303. doi:10.1080/09571736.2015.1053278
Glen, S. (2016). Hedges’ g: Definition, Formula. From StatisticsHowTo.com: Elementary Statistics for the rest of us! Retrieved August 08, 2020, from https://www.statisticshowto.com/hedges-g/
Goris, J., Denessen, E., & Verhoeven, L. (2019). Effects of content and language integrated learning in Europe A systematic review of longitudinal experimental studies. European Educational Research Journal, 18(6), 675-698. doi:10.1177/1474904119872426
Gorjian, B., & Hamidavi, N. (2017). Using Clil Method in Teaching Vocabulary to Intermediate Efl Learners. Modern Journal of Language Teaching Methods, 7(3), 13-23.
Hak, T., Rhee, H. V., & Suurmond, R. (2016, updated 2018). How to Interpret Results of Meta-Analysis. SSRN Electronic Journal. doi:10.2139/ssrn.3241367, Available at SSRN: https://ssrn.com/abstract=3241367
Hamidavi, N., Amiz, M., & Gorjian, B. (2016). The Effect of CLIL Method on Teaching Reading Comprehension to Junior High School Students. Modern Journal of Language Teaching Methods, 6(9), 64-73. doi:10.26655/mjltm.2016.12.1
Hamidavi, N., Amiz, M., & Gorjian, B. (2016). The Effect of Clil Method on Teaching Reading Comprehension to Junior High School Students. Bulletin De La Société Royale Des Sciences De Liège, 85, 1642-165.
Harrer, M., Cuijpers, P., Furukawa, T., & Ebert, D. (2019). Doing Meta-Analysis in R: A Hands-on Guide. Retrieved August 08, 2020, from https://bookdown.org/MathiasHarrer/Doing_Meta_Analysis_in_R/, doi:10.5281/zenodo.2551803
Isidro, X. S., & Lasagabaster, D. (2018a). Code-switching in a CLIL multilingual setting: A longitudinal qualitative study. International Journal of Multilingualism, 16(3), 336-356. doi:10.1080/14790718.2018.1477781
Isidro, X. S., & Lasagabaster, D. (2018b). The impact of CLIL on pluriliteracy development and content learning in a rural multilingual setting: A longitudinal study. Language Teaching Research, 23(5), 584-602. doi:10.1177/1362168817754103
Kovalik, S., & Olsen, K. (1993). ITI: The model: Integrated thematic instruction. United States: S. Kovalik & Associates.
Lasagabaster, D., & Doiz, A. (2015). A Longitudinal Study on the Impact of CLIL on Affective Factors. Applied Linguistics. doi:10.1093/applin/amv059
Lasagabaster, D., & Sierra, J. M. (2009). Immersion and CLIL in English: More differences than similarities. ELT Journal, 64(4), 367-375. doi:10.1093/elt/ccp082
Lo, Y. Y., & Jeong, H. (2018). Impact of genre-based pedagogy on students’ academic literacy development in Content and Language Integrated Learning (CLIL). Linguistics and Education, 47, 36-46. doi:10.1016/j.linged.2018.08.001
Madrid, D., & Barrios, E. (2018). A Comparison of Students’ Educational Achievement across Programmes and School Types with and without CLIL Provision. Porta Linguarum: Revista Internacional De Didáctica De Las Lenguas Extranjeras, (29), 29-50.
Mattheoudakis, M., Alexiou, T., & Laskaridou, C. (2014). To CLIL or Not to CLIL? The Case of the 3rd Experimental Primary School in Evosmos. Major Trends in Theoretical and Applied Linguistics Volume 3. doi:10.2478/9788376560915.p13
Mensel, L. V., Hiligsmann, P., Mettewie, L., & Galand, B. (2020). CLIL, an elitist language learning approach? A background analysis of English and Dutch CLIL pupils in French-speaking Belgium. Language, Culture and Curriculum, 33(1), 1-14. doi:10.1080/07908318.2019.1571078
Merino, J. A., & Lasagabaster, D. (2017). The effect of content and language integrated learning programmes’ intensity on English proficiency: A longitudinal study. International Journal of Applied Linguistics, 28(1), 18-30. doi:10.1111/ijal.12177
Moghadam, N. Z., & Fatemipour, H. (2014). The Effect of CLIL on Vocabulary Development by Iranian Secondary School EFL Learners. Procedia - Social and Behavioral Sciences, 98, 2004-2009. doi:10.1016/j.sbspro.2014.03.635
Morton, T., & Llinares, A. (2016). Students’ use of evaluative language in L2 English to talk and write about history in a bilingual education programme. International Journal of Bilingual Education and Bilingualism, 21(4), 496-508. doi:10.1080/13670050.2016.1192101
Myskow, G., & Ono, M. (2018). A matter of facts: L2 writers’ use of evidence and evaluation in biographical essays. Journal of Second Language Writing, 41, 55-70. doi:10.1016/j.jslw.2018.08.002
Nieto Moreno de Diezmas, E. (2016). The impact of CLIL on the acquisition of L2 competences and skills in primary education. International Journal of English Studies, 16(2), 81-101. https://doi.org/10.6018/ijes/2016/2/239611
Nieto-Moreno de Diezmas, E. (2018a). The Acquisition of L2 Listening Comprehension Skills In Primary And Secondary Education Settings: A Comparison Between Clil And Non-Clil Student Performance. RLA. Revista De Lingüística Teórica Y Aplicada, 56(2), 13-34. doi:10.4067/s0718-48832018000200013
Nieto-Moreno-de-Diezmas, E. (2018). Acquisition of reading comprehension in L1 in bilingual programmes of Primary Education. A comparative study. Ocnos, 17 (1), 43-54. doi: http://dx.doi.org/10.18239/ocnos_2018.17.1.1471
Nikula, T. (2016). CLIL: A European Approach to Bilingual Education. Second and Foreign Language Education, 1-14. doi:10.1007/978-3-319-02323-6_10-1
Ortega, L. (2015). Researching CLIL and TBLT interfaces. System, 54, 103-109. doi:10.1016/j.system.2015.09.002
Otwinowska, A., & Foryś, M. (2015). They learn the CLIL way, but do they like it? Affectivity and cognition in upper-primary CLIL classes. International Journal of Bilingual Education and Bilingualism, 20(5), 457-480. doi:10.1080/13670050.2015.1051944
Pastrana, A., Llinares, A., & Pascual, I. (2017). Students’ language use for co-construction of knowledge in CLIL group-work activities: A comparison with L1 settings. Zeitschrift Für Erziehungswissenschaft, 21(1), 49-70. doi:10.1007/s11618-017-0802-y
Pérez-Cañado, M. & Basse, R. (2015). Analysing Errors of CLIL and non-CLIL Primary School Students in their Written and Oral Productions: A Comparative Study. Procedia - Social and Behavioral Sciences, 173, 11-17. doi: 10.1016/j.sbspro.2015.02.023
Pérez-Cañado, M. L. (2017). The effects of CLIL on L1 and content learning: Updated empirical evidence from monolingual contexts. Learning and Instruction, 57, 18-33. doi: 10.1016/j.learninstruc.2017.12.002
Pérez-Cañado, M. L. (2018). CLIL and Educational Level: A Longitudinal Study on the Impact of CLIL on Language Outcomes. Porta Linguarum, 29(January), 51–70.
Pérez-Cañado, M. L. (2018a). CLIL and pedagogical innovation: Fact or fiction? International Journal of Applied Linguistics, 28(3), 369-390. doi:10.1111/ijal.12208
Pérez-Vidal, C., & Roquet, H. (2015). The linguistic impact of a CLIL Science programme: An analysis measuring relative gains. System, 54, 80-90. doi: 10.1016/j.system.2015.05.004
Pladevall-Ballester, E., & Vallbona, A. (2016). CLIL in minimal input contexts: A longitudinal study of primary school learners’ receptive skills. System, 58, 37-48. doi: 10.1016/j.system.2016.02.009
Pokrivčáková, S. (2015). CLIL in Slovakia: Projects, research, and teacher training (2005-2015). CLIL in Foreign Language Education: E-textbook for Foreign Language Teachers, 17-29. doi:10.17846/clil.2015.17-29
Prieto-Arranz J.I., Rallo Fabra L., Calafat-Ripoll C., Catrain-González M. (2015) Testing Progress on Receptive Skills in CLIL and Non-CLIL Contexts. In: Juan-Garau M., Salazar-Noguera J. (eds) Content-based Language Learning in Multilingual Educational Environments. Educational Linguistics, vol 23. 123-137, doi:10.1007/978-3-319-11496-5_8
Roquet, H., Llopis, J., & Pérez-Vidal, C. (2015). Does gender have an impact on the potential benefits learners may achieve in two contexts compared: Formal instruction and formal instruction + content and language integrated learning? International Journal of Bilingual Education and Bilingualism, 19(4), 370-386. doi:10.1080/13670050.2014.992389
Salamanca, C., & Montoya, S. I. (2018). Using CLIL Approach to Improve English Language in a Colombian Higher Educational Institution. English Language Teaching, 11(11), 19. doi:10.5539/elt.v11n11p19
Schmitt, N., Schmitt, D. & Clapham, C. (2001). Developing and exploring the behavior of two new versions of the Vocabulary Level Test. Language Testing, 18(1), 55–88.
Schroll, J. B., Moustgaard, R., & Gøtzsche, P. C. (2011). Dealing with substantial heterogeneity in Cochrane reviews. Cross-sectional study. BMC Medical Research Methodology, 11(1), 22. doi:10.1186/1471-2288-11-22
Sepešiová, M. (2019). New Perspectives in Pre-Service Teacher Training in CLIL via VLE. In C. Can, P. Patsala, & Z. Tatsioka (Eds.), Contemporary Means and Methods in ELT and Applied Lingustics (pp. 515-533). Tallin, Estonia: LIF - Language in Focus.
Straková, Z. (2020). CLIL and Global Education: A Meaningful Match. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference, 5, 546-557. doi:10.17770/sie2020vol5.4819
Surmont, J., Struys, E., Noort, M. V., & Craen, P. V. (2016). The effects of CLIL on mathematical content learning: A longitudinal study. Studies in Second Language Learning and Teaching, 6(2), 319-337. doi:10.14746/ssllt.2016.6.2.7
Sylvén, L. K. (2013). CLIL in Sweden – why does it not work? A metaperspective on CLIL across contexts in Europe. International Journal of Bilingual Education and Bilingualism, 16(3), 301-320. doi:10.1080/13670050.2013.777387
Taillefer, G. (2013). CLIL in higher education: The (perfect?) crossroads of ESP and didactic reflection. ASp, (63), 31-53. doi:10.4000/asp.3290
Terrazas Gallego, M. & Agustín Llach, M. P. (2009). Exploring the increase of receptive vocabulary knowledge in the foreign language: A longitudinal study. International Journal of English Studies, 9(1), 113–133, Available at https://revistas.um.es/ijes/article/view/90681/87481
Tzoannopoulou, M. (2015). Rethinking ESP: Integrating Content and Language in the University Classroom. Procedia - Social and Behavioral Sciences, 173, 149-153. doi:10.1016/j.sbspro.2015.02.045
Yang, Wen-hsien. (2016). ESP vs. CLIL: A coin of two sides or a continuum of two extremes?. ESP Today. 4(1). 43-68.
Zarobe, Y. R. (2008). CLIL and Foreign Language Learning: A Longitudinal Study in the Basque Country. International CLIL Research Journal, 1(1), 60-73.
Zarobe, Y. R. (2017). Improving reading strategy knowledge in young children: What self-report questionnaires can reveal. Elia, (17), 15-45. doi:10.12795/elia.2017.i17.02