Teachers’ life-long education for the educational system is not a choice any more, but becomes a constant need of the teaching profession, whereas investments in education represent a good investment for the future of each country. A few chapters of this thesis are dedicated to this topic. In line with the new provisions of the Bologna process which resulted in the reform of higher education, the thesis explains the importance of introducing the new curriculum for the education of teachers, whose function is to train future teachers for new tasks of educating pupils for the 21st century, i.e. educating the future generations for the time yet to come. The complexity of competencies which the contemporary teacher has to possess to perform quality teaching are presented in the last chapter of the thesis which offers examples of written lesson plans for the realisation of computer science in primary and secondary schools. This confirms the importance of acquiring the computer science knowledge and skills, as well as the pedagogic-psychological-methodological competencies to teach the subject Computer Science in schools.