Science and Education Publishing American Journal of Educational Research 2327-6150 5 2 2017 2 4 Managing the Uncertainty in the van Hiele Levels of Geometric Reasoning 109 113 EN Michael Gr. Voskoglou Mathematical Sciences, School of Technological Applications, Graduate Technological Educational Institute of Western Greece, Patras, Greece EDUCATION2017521 10.12691/education-5-2-1 2016 8 10 2017 1 8 2017 2 2 Student group total possibilistic uncertainty and probabilistic uncertainty are calculated for evaluating the student acquisition of the van Hiele levels of geometric reasoning and an example is presented illustrating our results.