The Greenfoot scenario "Planet Exploration" presented in the student book can be downloaded for free as a ZIP file (315 KB) under the section "Supplementary Materials." The concept of the new edition is based on the quote "Tell me and I forget, show me and I remember, let me do and I understand." - Confucius. This quote is the fundamental idea of the volume Computer Science 1. The constructivist principle - learning by doing - is intended to be central here. The book is designed and intended as a student workbook. The new edition of the volume is already aligned with the new computer science curriculum for North Rhine-Westphalia. Computer Science 1 clearly explains the fundamental content areas of computer science at the beginning and then opens up the perspective on the object-oriented viewpoint of the subject, aiming to achieve the core elements of object-oriented programming.