Methodology : The tools of the three-stage research include three questionnaires, distributed at time intervals sufficient for analyzing the results of each questionnaire and use its findings in the design of the next questionnaire. In the present RR only questionnaire 1 is relevant. It deals with visualization (relates to quadrilaterals), identification and construction of definitions, and inclusion relationships between groups of quadrilaterals. After administering the questionnaire and analyzing its results, 10 students were interviewed.