The Extremes Deutsch Aufbaustufe course is a set of 10,000 words at the advanced level, corresponding to well-developed linguistic skills and communicative competence of an educated German native speaker. Mastering this set of vocabulary items allows the learners to understand long and complex statements and texts and to formulate their own opinions on any given topics in a clear and coherent way. These skills correspond with the C1 level of the Council of Europe scale.