Information on the series edition: Clear structure: systematic, integrative, and differentiated development of basic knowledge in the main learning area with "Testen-dich!" pages. Linking with the second learning area and parallel differentiation on demand and promote pages. Class work training or project proposals on "fit-in-..." pages. Basic principles: diagnosing, differentiating, teaching skills. Free online diagnosis. Consistent differentiation at different levels. Learning transparency: advance organizer, self-diagnosis. Process-oriented preparation for class tests. Independent and cooperative learning. Workbooks with solution insert and CD-ROM. Differentiated range of exercises and learning status tests. CD-ROM with about 300 interactive exercises at two levels. Differentiation and support: support materials in the folder. The folder provides support material for the students.