Győry, ÁkosKónya, Eszter2024-09-042024-09-042018-06-01Teaching Mathematics and Computer Science, Vol. 16 No. 1 (2018) , 93-1101589-7389https://hdl.handle.net/2437/379821We carried out research using Zalman Usiskin's test (1982) and also a modified version of his test to see how the geometric approach of secondary school students (Grades 8-10) specialized in mathematics had changed. We observed two groups of students for several years. Our aim was to find a relation between the change of the mean of the van Hiele level of the students and the structure of the geometry syllabus. We also observed if there was a change in the geometric approach of the students during the summer holidays and if so, in what way it changed.application/pdfVan Hiele theoryLevels of geometric thinkingStructure of the geometry syllabusSummer holidayfolyóiratcikkOpen AccessÁkos Győry and Eszter Kónyahttps://doi.org/10.5485/TMCS.2018.0448Teaching Mathematics and Computer Science116Teach. Math. Comp. Sci.2676-8364