The purpose of this master thesis is to study skills students in a Danish 6th grade develop while they are programming using the tool Scratch. Programming in elementary schools is currently part of the learning debate in Denmark and other countries due to the focus on 21st century skills and the national curriculum where ICT is a transverse issue in all subjects. In addition, technology is a basic condition of life now and in the future and it requires that students develop skills to use, understand and create technology. Programming can be an approach to developing these skills. To do so, we made research in a 6th grade with 17 students in five sessions. Through interviews, participant observations and video observations, we examined how students develop 21st century skills, computational thinking and digital literacy when programming. The result indicates that students develop skills as problem solving, collaboration and communication as well as concepts and approaches from computational thinking. There are also signs that the students develop digital literacy in the form of being able to handle and create technology through programming. The students also gain insight in what lies behind advanced video games when programming a simple game in Scratch.