Einsterns Schwester Themenhefte has a modular structure, consisting of four thematic booklets and one project booklet in a slipcase. The four thematic booklets cover the following areas: language study, correct writing, text planning, and independent reading and writing, as well as course-oriented work. The learning sections are designed in small steps, with each page focusing on a specific learning target, marked as elective or compulsory. There are also reflection pages for thinking about personal learning. The materials are suitable for grades 2-4 and include rental and consumable resources.

The learning concept of Einsterns Schwester - Sprache und Lesen emphasizes subject-oriented and largely independent work by children, allowing them to learn at their own pace and through various approaches. Exercises aimed at enhancing working memory and attention are integral to the concept and serve as important building blocks for lifelong learning.