Information on the title: Systematic, integrative, and differentiated. The concept of the extended edition is the same as that of the differentiated edition, but at a higher level. It is ideal for use in secondary schools, in higher-performance classes, and for external differentiation in extension courses. This edition prepares students for their secondary school leaving certificate and ensures that they can be integrated into the grammar school system. It offers an even more comprehensive range of factual and literary texts.