Information about the title: Clear structure: systematic, integrative, and differentiated acquisition of basic knowledge in the main learning area with "Test Yourself!" pages that connect with the second learning area and offer parallel differentiation based on need and support. Teaching work training or project proposals for "Fit-in-...!" Basic principles: diagnostics, differentiation, teaching competencies. Free online diagnostics. Consistent differentiation at various levels. Learning transparency: pre-structurers, self-diagnosis. Process-oriented preparation for class tests. Independent and cooperative learning. Information on the series edition: clear structure: systematic, integrative, and differentiated acquisition of basic knowledge in the main learning area with "Test Yourself!" pages that connect with the second learning area and offer parallel differentiation based on need and support. Teaching work.