Beaver contest in the first three-year cycle of elementary school

Beaver is international problem solving contest with a focus on computational thinking. It is one of the ways to increase interest in computer topics among children. The first part of the thesis is devoted to the presentation of the Beaver contest and its tasks. We presented the computational thinking, active learning and problem-based learning. In the empirical part we focused on problem solving tasks in the Beaver contest in the first three years of primary school, we found the learning objectives, which relate to computational thinking. We have examined the tasks that were prepared within the Beaver contest for students at this stage. At two selected elementary schools, the examination of computer science knowledge was performed among students in the first three years with the tasks from the Beaver contest in 2015. We also carried out an interview with the teachers to check their opinion on difficulty of the Beaver tasks that were solved by the students, and correlations between the tasks and themes from the curriculum