The aim of this study was to examine 6-8th grade students’ performances when they were asked to identify, name, and draw geometrical objects. In order to investigate students’ geometrical structures, van Hiele theory was employed with the help of a model developed by Gutierrez et al. (1991, 1998). The data was collected from 809 6th to 8th grade middle school students in Ankara, Turkey. The analysis of the data revealed that most of the students had difficulty to think 3 dimensionally, and so to reach 1 st van Hiele level with complete acquisition. The findings are discussed and implications for educational field are presented.