A new Finnish study challenges the belief that similar foreign languages interfere with each other in learning. Instead, learning languages like Swedish and German simultaneously can support writing skills across both.

"Study finds similar foreign languages strengthen each other in learning
INFORMATION  10 JUNE 2025
A girl studying at home. Photo: Vesa Moilanen / LehtikuvaSTUDY
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New research from the University of Turku challenges a widely held belief about language learning: that studying similar foreign languages at the same time causes confusion. The study suggests the opposite, that languages like Swedish and German, when learned together, can support one another.


The findings come from the doctoral research of Veijo Vaakanainen, who examined the writing skills of Finnish learners of Swedish. His study found that language similarity can be a resource rather than a hindrance, especially in developing cohesive writing.


“Language similarity supports writing development in both Swedish and German,” Vaakanainen said in a university statement. “This contradicts the common idea that such languages interfere with each other.”


Writing in a foreign language involves more than vocabulary and grammar. It also requires the ability to construct coherent texts by linking ideas and expressing relationships between sentences, a challenge even for advanced learners.


Vaakanainen’s research focused on how learners form cohesive written texts as their language skills develop. He observed that as proficiency improved, so did the diversity and complexity of the learners’ text structures.


The study offers concrete guidance for how foreign languages could be taught more effectively in schools.


“First, language instruction should pay more attention to discourse-level features, not just words and sentences,” Vaakanainen said. “Second, we should develop multilingual teaching approaches that allow learners to use their full language repertoire without strict separation between language subjects.”


His findings support the idea of more integrated and flexible language education policies, where learners can transfer knowledge and strategies across languages instead of treating them as isolated systems."


https://www.helsinkitimes.fi/176-information/study/27097-study-finds-similar-foreign-languages-strengthen-each-other-in-learning.html
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