The article summarizes the work and results of the bilateral project MEB 090907 that was run in 2009-2010 in collaboration of Dept. of Physics Education, Faculty of Math.and Physics, Charles university in Prague (principal investigator: doc. Leos Dvorak) and Faculty of Mathematics and Physics, University of Ljubjana, SLovenia (principal investigator: prof.
Gorazd Planinsic).