Didactical methods and tool selected by the teacher to be applied in lesson have an important role in the
formation and development to the school children of concepts of natural sciences, but also in correcting those
incorrectly formed. In their choosing, the teacher must to consider the fact that as school child grows up, it is
realized gradually transition from the global intuitive nature of the small school child’s thinking, to the stage of
notional thinking, which is reached around the age of 10 years. As mentioned by Nicola et al. (1982), at the small
school child “thinking remain predominantly concrete”, even this “perceives the relations which allows
understanding of causality and uses more correctly the logical links”. “Thinking realizes knowledge with the aid of
some logical, concrete, objectual operations” (Nicola et al., 1982, p.51-52).