The textbook "Klartext 5. Differentiated Edition" by Westermann offers a structured and systematic approach to German language instruction in secondary education. It is specifically designed to cater to the different learning levels of students. With a clear organization into thematic chapters, learning is facilitated and promoted. The book integrates cooperative learning methods that support the handling of heterogeneity in the classroom. Additionally, it provides differentiated options for competency assessment, allowing learners to independently evaluate and reflect on their performance level. These features create optimal conditions for learning success and encourage active engagement with the learning content.