The comprehensive differentiated offering! Proven concept in the student book marked differentiation in three phases, graded exercise sequences, repetition at two learning levels, competency-oriented tasks, student CD-ROMs in the existing student books from grades 5 to 9. New: student CD in student book 9, worksheets with three difficulty levels. References in the student book connect the book and CD-ROM. Learning game modules with playful tasks and puzzles. Workbooks for individual support and challenge. Diagnostic test: students check their competencies. Evaluation: students evaluate their own test, teachers analyze strengths and weaknesses. Support worksheets: basics with simple tasks, extension with more difficult exercises. Challenge worksheets: with demanding tasks. Solutions teacher CD-ROMs included in the answers. Suggestions for class tests (editable). Task sheets with dy.