The basis of CLIL (Content and Language Integrated Learning) is that new subject content from other curriculum areas is taught and learnt through the new language. In other words, children’s learning experience is enhanced by exploiting the links between the two subjects. Since it is used for real purposes, the new language is also learned more ‘naturally’ thus building on other forms of learning. As the subject content should always be the main focus of the CLIL lesson, children should be encouraged to draw on their knowledge about language in order to make sense of new concepts. CLIL is based on language acquisition so children’s fluency is more important than accuracy. Existing subject lesson plans have to be modified to take into account children’s ability in the new language, and therefore the planning process is vital.