Three LS groups were set up in three secondary schools. The purpose of this study was to encourage the innovative use of Geometer's Sketchpad (GSP) in the teaching and learning of mathematics among secondary school teachers in Malaysia through Lesson Study (LS). However, the students in the treatment group achieved better levels of geometric thinking compared to the students in control group (t = 34.50, p

The results found that the students in both groups showed increment in their post-VHGT as compared to the pre-VHGT. Wilcox on-t test for the design of repeated measurement was used for the data analysis. At the end of the study, the students in both groups were given the VHGT for the second round to analyse their final levels of geometric thinking. Before the study started, students from both groups were given Van Hiele’s Geometry Test (VHGT) to identify their initial levels of geometric thinking. The students in the treatment group learned Form Two’s Transformation topic through the Van Hiele’s phases of learning using the GSP, while the students in the control group learned the same topic conventionally. A total of 47 students were in the control group and the rest were in the treatment group.

This quasi-experiment involved 94 students and two teachers. The purpose of this study was to test the effectiveness of Van Hiele’s phases of learning geometry using the Geometer’s Sketchpad (GSP) on students’ levels of geometric thinking.

Geo sketchpad