Enhancing Students’ Geometric Thinking Through Phase Based Instruction Using Geometer’s Sketchpad: A Case Study

I investigated Form One students learning of solid geometry in a phase-based instructional environment using Geometer s Sketchpad (GSP) based on the van Hiele theory. Specifically, I examined the students initial van Hiele levels of geometric thinking about cubes and cuboids, and how their van Hiele levels changed after phase- based instruction with GSP. I used a case study research design and purposeful sampling to select six case study participants from a class of mixed-ability Form One students. Findings reveal that the participants initial van Hiele levels ranged from Level 0 to Level 2. After phase-based instruction with GSP, their van Hiele levels either increased or remained the same.