Parents choosing a school in Europe are often told that a bilingual education will make a child smarter, more flexible and better prepared for the world. Some of this is true. Some is overstated. This guide separates what is well supported from what is marketing, and explains how to judge a school's language provision.
The clearest gain is the language itself
The most reliable benefit of a bilingual school is also the most obvious: the child becomes proficient in a second language, and sometimes a third. That proficiency is practical. It affects where a child can study and work, how easily they can make friends when the family relocates, and how comfortably they take part in a country's life.
Proficiency, however, is not automatic. It depends on time, quality of teaching and the child's use of the language outside lessons. A school that teaches one hour of French a week will not produce a bilingual child; a school that teaches half the curriculum in French usually will.
What about the claims for the brain?
You will often read that bilingual children have stronger executive function, which covers attention, switching between tasks and ignoring distractions. The evidence is contested. Systematic reviews and meta-analyses have failed to find compelling evidence of cognitive advantages in healthy adults, and effect sizes show signs of publication bias. Critics cite small samples and inconsistent definitions of bilingualism.
Some benefits have better support:
- Metalinguistic awareness: bilinguals tend to separate the structure of language from its meaning more readily.
- Theory of mind: a 2018 meta-analysis found that bilingual children outperformed monolingual children on theory-of-mind tests.
- Cognitive reserve in later life: several studies report that bilingual patients show symptoms of dementia a few years later on average, although the mechanism and the size of the effect remain debated and this is not prevention.
An honest summary is this: the language gain is certain, some linguistic and social-cognitive advantages are plausible, and a general boost to intelligence has not been demonstrated. A good school should not promise it.
Academic results
Summaries of bilingual programmes, mostly from North America, report that students tend to earn better grades in language arts, mathematics and science, to graduate at higher rates and to report more self-confidence. Treat this with caution. Such summaries do not always give effect sizes or study designs, and families who choose bilingual programmes may differ from those who do not.
A more careful reading is that a well-run bilingual programme does not harm achievement in the main language, and may help. The important phrase is well-run. Where teachers are not fluent in both languages, or where the second language is introduced without support, results suffer.
Common models in European schools
Bilingual schools vary in how they divide the day. The main models are:
| Model | How it works | Typical result |
|---|---|---|
| Immersion | Most or all teaching in the second language, with the home language taught as a subject | Strong second-language proficiency |
| Two-way (dual language) | Two languages used for teaching, with native speakers of each in the class | Biliteracy for both groups |
| 50/50 split | Instruction divided evenly between the two languages from the start | Balanced development |
| 90/10 | Begins mostly in the minority language, shifting gradually toward balance | Strong minority-language base |
| Extra language | A foreign language is taught as a subject, often for several hours per week | Useful competence, rarely fluency |
In the European Schools system, pupils take most subjects in their mother tongue, learn a second language from the early years, and from the third year of secondary school take history and geography in that second language. The European Baccalaureate, awarded by that system, requires high proficiency in two languages.
The mother tongue matters
A frequent mistake is to treat the school language as the only language that counts. Children who lose their home language often lose access to grandparents, cousins and part of their identity, and may find it harder to develop strong literacy in any language.
Ask the school how it supports the mother tongue: is it taught in timetabled lessons, and is it supported by teachers qualified in it? At home, keep one language consistent with each parent or in each setting. Reading aloud and books in the home language are among the most effective supports.
Start age: earlier is easier, but later works
The benefits of bilingualism are usually greatest when children are exposed to multiple languages early, which many bilingual programmes provide. Young children generally find accent and fluency easier to acquire.
That does not mean that an older child cannot succeed. A child of 11 or 13 can reach strong proficiency with good teaching and daily use; it simply takes concentrated effort, and the school must provide support in the first year. For children in the later years of secondary school, a move to an unfamiliar language of instruction is the hardest case. A school that offers a gradual transition is worth far more than one that simply places the child in a class.
Extra languages: how many are too many?
Some international schools offer three or four languages. Whether this helps depends on time. A child who spends an hour a week on each of three languages will make modest progress in all of them; a child who focuses on two will usually do better.
Sensible guidelines:
- Establish the first language and one strong second language before adding a third.
- Prefer a language the child will actually hear outside school, usually the local language.
- Check the hours per week, the group size and the qualification at the end, such as an external language certificate.
Questions to ask a school
- What proportion of teaching is in each language, at each age?
- Are teachers native or near-native speakers of the language they teach in?
- How are children assessed in each language?
- What support is there for pupils who arrive without the language of instruction?
- How is the mother tongue supported?
- What do leavers achieve: which qualifications, and in which languages?
- What is the experience of children who arrive in the later years of the school?
Treat vague answers as informative. Schools that are serious about language usually have precise ones.
What families should expect
A realistic expectation is that a child in a good bilingual programme will understand and speak the second language fluently within two to three years, read and write it competently somewhat later, and use it comfortably for academic work by the end of primary or early secondary school. Some children will go faster, others slower.
During the early period, there may be a dip in confidence and performance in some subjects. This is normal, and it usually passes. The school's response, and your own, make the difference: patience, encouragement and continued use of the home language.
A balanced conclusion
Language skills are among the most useful things a school can give a child. The strongest case for a bilingual education is therefore the plainest one: it gives access to two languages and two cultures. Wider cognitive claims are less certain. Choose the school whose language provision is serious, consistent and well taught, and judge it by what the children can actually do.
Sources
- Wikipedia, Bilingual education (programme models, academic outcomes, caveats): https://en.wikipedia.org/wiki/Bilingual_education
- Wikipedia, Cognitive effects of bilingualism (state of evidence): https://en.wikipedia.org/wiki/Cognitive_effects_of_bilingualism
- Wikipedia, European School system (second-language teaching): https://en.wikipedia.org/wiki/European_School_system
- Wikipedia, European Baccalaureate (language requirements): https://en.wikipedia.org/wiki/European_Baccalaureate