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THE ROLE OF CLIL IN ENHANCING ENGLISH PROFICIENCY
IN STEAM SUBJECTS AMONG UZBEK STUDENTS
Orifjonova Manzura Sultonali qizi
Teacher of Foreign Languages Faculty
Gulistan State Pedagogical Institute
manzuraorifjonova007@mail.ru
Abstract: This study investigates the role of Content and Language
Integrated Learning (CLIL) in enhancing English proficiency among secondary
school students studying STEAM (Science, Technology, Engineering, the Arts, and
Mathematics) subjects in Uzbekistan. As the country promotes English-medium
instruction in science and technology, the effectiveness of CLIL as a dual-focused
educational approach becomes increasingly relevant. A quasi-experimental
research design was employed, involving Grade 9 students in two Tashkent schools
over a 16-week semester. One group received CLIL-based instruction, while the
control group followed a traditional content-focused approach. Pre- and post-tests,
classroom observations, and questionnaires were used to assess language gains and
engagement. Results showed that students in the CLIL group demonstrated
statistically significant improvement in English proficiency, particularly in
vocabulary and listening comprehension. Qualitative data supported these findings,
revealing higher levels of motivation, confidence, and academic English use. The
study concludes that CLIL has strong potential for enhancing both language and
subject learning in the Uzbek educational context and recommends broader
implementation supported by curriculum development and teacher training.
Keywords: CLIL, STEAM education, English proficiency, bilingual
education, Uzbekistan, language learning, STEM, secondary education, content and
language integration, educational reform
Introduction
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Content and Language Integrated Learning (CLIL) is a progressive
educational methodology in which students learn subject content through a foreign
language, most commonly English. This approach aims to enhance both subject
matter understanding and language acquisition, promoting a dual-focus that aligns
well with the demands of a globalized world. In the context of 21st-century
education, CLIL has emerged as a powerful tool, especially within STEAM
(Science, Technology, Engineering, the Arts, and Mathematics) education, where
both technical content and academic communication are crucial. Across Europe and
parts of Asia, CLIL has been widely adopted in secondary and higher education to
prepare students for international mobility, interdisciplinary learning, and
multilingual work environments.
Globally, the integration of CLIL into STEAM fields is growing. Countries
like Spain, Finland, and Japan have implemented CLIL in STEM-based programs to
reinforce students' academic English while mastering scientific and technical
concepts. These countries have reported improvements not only in language
proficiency but also in classroom engagement and content comprehension. In
Uzbekistan, educational reform has been moving rapidly in the direction of English-
medium instruction, particularly in science and technology subjects. In recent years,
national policies have encouraged the use of English as the language of instruction
in higher education and some secondary schools. However, these efforts often face
obstacles, including a lack of resources, insufficiently trained teachers, and students’
limited English proficiency. Despite the growing emphasis on English within
STEAM fields, many Uzbek students continue to face challenges in acquiring the
language skills needed for full comprehension and academic success. In most
schools, English and content subjects are still taught separately, resulting in limited
opportunities for students to use English in meaningful, subject-relevant contexts.
This disconnect underscores the need for integrated pedagogical approaches such as
CLIL. However, research on the implementation and effectiveness of CLIL in
Uzbekistan, particularly in the STEAM context, remains scarce. The primary
objective of this study is to explore the effectiveness of CLIL in improving English
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proficiency among secondary school students in Uzbekistan who are studying
STEAM subjects. Specifically, the research seeks to identify the degree of
improvement in language skills—such as vocabulary, reading, speaking, and
listening—when science and technology content is delivered through English. This
study is guided by two key research questions: (1) Does CLIL improve English
proficiency in STEAM learners in Uzbekistan? (2) Which specific language skills
benefit
the
most
from
CLIL-based
instruction?
The findings of this study aim to contribute to Uzbekistan’s educational reform by
providing data-driven insights into how CLIL can support English language learning
in STEAM education. The results may also offer practical recommendations for
curriculum developers, teacher training programs, and education policymakers
interested in adopting CLIL more broadly across the national education system.
Methods
This research employed a quasi-experimental design, comparing the
outcomes of two student groups: one exposed to CLIL-based instruction and another
following a traditional content-focused approach. A mixed-methods approach was
used, combining quantitative test results with qualitative feedback from participants
to capture a holistic picture of the impact of CLIL on language development.
The study was conducted in two public secondary schools in Tashkent, Uzbekistan,
during the spring semester of the academic year. Sixty students in Grade 9
participated, aged 14–15, all enrolled in science and technology streams. The
students were divided into an experimental group (n = 30) and a control group (n =
30). All students had a comparable level of English proficiency (A2–B1 on the
CEFR scale) based on initial placement testing. The selection of schools was based
on their willingness to participate in the pilot and their use of English materials in
STEAM courses.
Instruments used in the study included an adapted English proficiency test,
teacher-designed observation checklists, and structured student and teacher
questionnaires. The English test, based on the Cambridge English Preliminary
framework, assessed reading, listening, grammar, and vocabulary. It was
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administered before and after the 16-week intervention. The observation checklist
measured classroom interactions, student participation, and use of academic English.
Questionnaires gathered participant perceptions about lesson clarity, engagement,
and language confidence. The CLIL intervention spanned one semester (16 weeks).
Teachers in the experimental group received preliminary training on CLIL
strategies, such as scaffolding language, using visuals and realia, and promoting
group discussion in English. Physics and biology lessons were delivered primarily
in English, incorporating subject-specific vocabulary and academic phrases. In
contrast, the control group received instruction in Uzbek or Russian, with little
emphasis on English. All other classroom conditions, such as lesson timing and
classroom resources, were kept similar across both groups. Data analysis was carried
out using SPSS. Paired sample t-tests were performed to compare pre- and post-test
scores within each group and between the groups. Descriptive statistics summarized
language skill gains. In addition, open-ended responses from the questionnaires were
coded and analyzed using qualitative content analysis to identify common themes.
Results
The results revealed a significant improvement in English proficiency among
students in the CLIL group compared to those in the control group. The average pre-
test score for the experimental group was 64.3 which increased to 77.1 in the post-
test—a gain of 12.8 points. In contrast, the control group improved from 65.1 to
68.4, a marginal increase of 3.3 points. The improvement in the experimental group
was statistically significant (p < 0.01), while the control group’s gain was not (p >
0.05). When analyzing language skill areas separately, the experimental group
demonstrated the greatest improvement in vocabulary (+15%) and listening
comprehension (+13%). Reading skills improved by 9%, while teacher evaluations
of speaking and writing suggested a 7% improvement. These results suggest that
CLIL's emphasis on contextualized vocabulary and auditory exposure through
lectures
and
multimedia
supported
language
acquisition.
Qualitative feedback supported the quantitative findings. Students in the
experimental group reported that learning science in English helped them understand
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both the language and the subject better. Many expressed increased confidence in
using English in real-life situations. Teachers noted that students in CLIL lessons
asked more questions in English, showed greater interest in terminology, and were
more active in group discussions. Classroom observations revealed higher
engagement, peer collaboration, and the use of academic English phrases during
experiments and problem-solving tasks.
Discussion
The findings confirm that CLIL has a positive impact on the English
proficiency of STEAM students in Uzbekistan. Students taught through CLIL not
only improved their test scores but also gained functional language skills relevant to
science and technology. The results demonstrate that integrating language learning
into subject teaching can bridge the gap between theoretical knowledge and practical
application in multilingual contexts.
These outcomes are consistent with international literature on CLIL. Studies
from Spain and Italy also found that students exposed to CLIL in STEM subjects
outperformed their peers in language acquisition, especially in academic vocabulary
and listening. What distinguishes the Uzbek context, however, is the relatively
limited exposure students have to English outside the classroom. This makes the role
of CLIL even more critical, as it becomes one of the few authentic avenues for using
English meaningfully.
The implications of these findings are far-reaching. For curriculum developers, the
study underscores the need to design integrated materials that address both language
and content learning. For teacher educators, it highlights the importance of preparing
teachers to manage dual objectives—language and subject mastery. For
policymakers, the results support further investment in CLIL-friendly environments,
including bilingual textbooks, training, and assessment systems. Nevertheless, the
study had limitations. It was limited to two schools in an urban setting and conducted
over one semester. The sample size was relatively small, and teacher experience may
have influenced lesson quality. Long-term effects of CLIL and its impact on deeper
content understanding were not measured. Future research should consider
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longitudinal studies to evaluate sustained language and content learning outcomes.
Studies in rural areas and among different age groups could provide a more
comprehensive view. Further exploration into the integration of CLIL in other
subjects, such as art or ICT, could help diversify the application of the approach
across the curriculum. Additionally, investigating how CLIL affects teacher
development and classroom dynamics would offer valuable insights for
implementation at scale.
Conclusion
This study demonstrates that CLIL is an effective strategy for improving
English language proficiency in STEAM subjects among Uzbek secondary school
students. Through exposure to subject-specific vocabulary and content in English,
students in the experimental group showed notable gains in vocabulary, listening,
and overall language competence. The findings suggest that adopting CLIL could be
a significant step forward in aligning Uzbekistan’s education system with
international standards and preparing students for global academic and professional
environments. Continued investment in teacher training, curriculum development,
and educational research will be essential for the successful integration of CLIL
across the nation’s schools.
References
Coyle, D., Hood, P., & Marsh, D. (2010). CLIL: Content and language integrated
learning. Cambridge University Press.
Mehisto, P., Marsh, D., & Frigols, M. J. (2008). Uncovering CLIL: Content and
language integrated learning in bilingual and multilingual education. Macmillan
Education.
Lorenzo, F., Casal, S., & Moore, P. (2010). The effects of CLIL on learners’
linguistic competence: A case study. International Journal of Bilingual Education
and Bilingualism, 13(5), 561–576. https://doi.org/10.1080/13670050.2010.503586
Ministry of Public Education of the Republic of Uzbekistan. (2022). National
strategy for foreign language development 2021–2025. Tashkent: Ministry of Public
Education.
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Dalton-Puffer, C. (2011). Content-and-language integrated learning: From practice
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https://doi.org/10.1017/S0267190511000092
