1. VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, jirina.vontorova@vsb.cz
2. VŠTE, Faculty of Institute Technology and Business, Department of Mechanical Engineering, České Budějovice, Czech Republic, EU, podjuklova@mail.vstecb.cz
3. Department of Technical and Vacational Education, Faculty of Education, University of Ostrava, Czech Republic, EU, jitka.podjuklova@osu.cz