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        There are differences between content-based language teaching (CBLT) and content and language integrated learning (CLIL), the main one being that CBLT deals with teaching content in language lessons, whereas CLIL deals with teaching a subject at the same time as teaching language. CLIL is also different from immersion, where learners learn all their subjects in another language and there is no focus on language in subject lessons, for example in an international school. These ideas can be visualised as a continuum. On the left-hand side of the continuum, content-based language teaching is where language teachers teach another language through content - so the focus is on language and the input for language classes is topics based on subject content. On the right-hand side of the continuum, learners are working all the time in another language. CLIL can be placed somewhere in the middle of the continuum: learners are learning content through another language. Typically, they have a number of lessons in one or more subjects per week in another language (for example, geography, history, science, PE or music) and the rest of their lessons in their first language.

(Liz Dale, Rosie Tanner. CLIL activities: a resource for subjects and language teachers)