A CLIL lesson is therefore not a language lesson neither is it a subject lesson transmitted in a foreign language. According to the 4Cs curriculum (Coyle 1999), a successful CLIL lesson should combine elements of the following:
Using language to learn whilst learning to use language
Content-Based Instruction better reflects learners’ needs for learning a second language
CLIL refers to situations where subjects, or parts of subjects, are taught through a foreign language with dual-focused aims, namely the learning of content, and the simultaneous learning of a foreign language".