In a design-research project on problem-solving, theory-based and practice-oriented materials were developed with the goal of fostering systematical development of students' problem-solving competence in a targeted manner by learning heuristics. Special attention was given to working backward strategy, which has been shown difficult for students…

In the era of contemporary society, which revolves around the fast information science revolution, the pupil is no longer just an observer in the educational process but rather an active constructor of one's own knowledge. Current didactic theories proclaim teaching, in which the teacher is an instructor and a facilitator, and as such should…