The iTEO app is a sequel of the original TEO project in the early nineties. Children learn languages through storying with the application iTEO which records and edits oral texts. Pupils can discuss contents and processes in one language and tell stories in another. In particular, it is possible to analyse the strategies children use to mediate language learning during the collaborative construction of stories. Actor-Network-Theory allows for uncovering the particular role and function of the iTEO app which can be downloaded in the AppStore.