A teacher’s attitude and the teaching strategies he/she uses significantly influence educational outcomes, see e.g. (Švec,2012). Observations from Czech schools suggest that pupils as
well as teachers prefer problems in whose case the algorithm suitable for their solution is apparent, in whose case there are no doubts about the choice of the suitable algorithm
(Novotná,2000).
In that case the class does not have to undergo the painstaking procedure of looking for this algorithm and can omit the often lengthy and difficult journey to grasping of the problem.
The role of the teacher is simpler, he/she only has to detect the place where pupils make mistakes and assess correctness of their solutions. That is the reason why teachers often choose
problems in whose case the search for the appropriate algorithm is easy and also often hint at the suitable solving procedure.
This means pupils instead of solving a problem simply apply some algorithm chosen according to the signals from the assignment or the teacher.