In this paper, we describe a didactic concept for the impartation of elementary computer science competences in early childhood education and primary school. Illustrative material, experimenting material, and a manual for (preschool) teachers have been conceptualized. The experimenter's kit covers the topics "Computer scientists", "Pixel", "Digital and analog representation", "Computer and its components", "Algorithms", and "Search and sorting algorithms". Material has been evaluated by educators and preschool children in 2 preschools. Evaluation focuses on handling of manual and material by preschool teachers, appropriateness of material for children aged 5 to 6 years, and intended future use of material. Data collection has been based on standardized questionnaires and participatory observation. Our results show that the manual and illustrative materials are suitable for use by educators without computational background. Predominantly, children can easily handle the experimenting material and like playing with it. A pilot test of material in primary school is pending.