A subject lesson with visible language support
The content objective remains central. Vocabulary, sentence frames or models help students reach it.
What is CLIL?
CLIL stands for Content and Language Integrated Learning. Students learn meaningful subject content through an additional language while receiving deliberate support for the language they need to access, discuss and demonstrate that learning. It is not a language lesson with a subject-related theme.
Technical classroom example
A computer science teacher teaches network topologies in English using diagrams, six essential terms, sentence frames and structured comparison. Students learn the technical content and the language needed to justify a design choice.
Is this CLIL?
A language lesson with a subject theme
Learning subject words alone does not replace meaningful subject understanding and application.
Language used for real thinking
Students compare, sequence, explain, solve, justify or create through the additional language.
Translation added to an unchanged worksheet
Translation may support access, but it does not by itself create interaction, cognition or language growth.
Scaffolding that can be reduced
Support responds to a barrier and helps students move towards greater independence.
Lowering the subject challenge automatically
A learner's current English level is not a measure of subject knowledge or thinking ability.
The 4Cs
Plan for Content, Communication, Cognition and Culture.
Content
Define the subject knowledge or skill students will develop.
Planning questionWhat should students understand or be able to do?
ExampleIdentify and compare network topologies.
Communication
Make the language needed to learn and explain the content visible.
Planning questionWhat words, structures and functions will students need?
Example“One advantage of a star topology is…”
Cognition
Choose the thinking students will perform with the content.
Planning questionWill they compare, justify, solve, evaluate or design?
ExampleJustify which topology best suits a small workplace.
Culture
Notice perspectives, contexts and assumptions that shape the task.
Planning questionWhose context is represented or assumed?
ExampleCompare how cost and user needs influence network design in different workplaces.
One connected lesson
Students compare three network topologies (Content), use technical terms and comparison frames (Communication), evaluate constraints and justify a recommendation (Cognition), then consider how workplace size, resources and user needs change the decision (Culture).
The language triptych
Plan for the language students need before, during and through the task.
Language of learning
Subject vocabulary and structures needed to understand the content.
Examples: database, primary key, relationship; “A primary key identifies…”
Language for learning
Language needed to compare, describe, justify, sequence, ask questions and collaborate.
Examples: “Can you explain…?” “Our group chose…” “I agree because…”
Language through learning
New language that emerges while students think, interact and refine understanding.
Example: a student realises that efficient is needed to justify a design choice.
Build your first CLIL lesson
- 1
Set the subject learning goal
State what students should understand, apply or produce. Keep this goal visible when adding language support.
- 2
Identify the thinking students will do
Choose a meaningful process such as comparing, sequencing, solving, explaining, evaluating or designing.
- 3
Identify the language they will need
Note essential technical terms and the language students need to participate and show their reasoning.
- 4
Add only the necessary scaffolding and interaction
Use a diagram, short glossary, model, sentence frame, rehearsal or structured role where it opens access to the task.
- 5
Decide how students will demonstrate their learning
Choose evidence that fits the content goal and clarify whether language is being formally assessed.
Common CLIL challenges
Too much unfamiliar vocabulary
Select six to ten essential terms, explain them in context and recycle them during the task. Do not pre-teach every unfamiliar word.
Students understand but cannot explain
Provide precise sentence frames, a model response and private rehearsal time before public speaking or writing.
An adapted text has lost important subject meaning
Compare it with the permitted source. Restore technical terms, qualifications, causal relationships, numbers and process order before use.
Mixed language levels
Keep a shared content goal and vary text density, scaffolds, preparation time or output support rather than assigning unrelated work.
Students remain passive
Use structured pair or group roles with a clear subject product and language that each student must use to contribute.
Assessment becomes primarily a language test
Decide what evidence of content understanding matters and whether language is a goal or mainly the means of showing that understanding. Avoid penalising one language difficulty several times.
CLIL and AI
Check and adapt AI drafts before using them with your class.
What AI can draft
- Draft lesson structures
- Adapt permitted source material
- Generate vocabulary support
- Suggest discussion questions
- Create differentiated versions
- Draft language scaffolds
- Produce possible assessment tasks
What to check
- Subject accuracy and preservation of important meaning
- Suitability for the specific students and approximate language level
- Bias, privacy and copyright
- Classroom timing and accessibility
- Whether the activity supports the content objective
- Whether the output needs correction or removal
An AI-generated CEFR estimate is an approximate planning aid, not an objective language assessment.
Sources and further reading
The selected references in each handbook identify the sources used for the CLIL and responsible-AI guidance.