Stufen International 1 is a German as a Foreign Language (DaF) coursebook for teenagers and adults. It is the first volume of a three-level German language course developed by Klett. The book combines course material and exercises and introduces learners to basic German communication through dialogues, texts, vocabulary, grammar activities, pronunciation practice, and cultural information. It aims to develop practical language skills for everyday situations and provides a foundation leading towards the Zertifikat Deutsch examination.