The purpose of this article is to devise the activities based on van Hiele levels of geometric thought using computer software, Geometer`s Sketchpad (GSP) as a tool. The most challenging task facing teachers of geometry is the development of student facility for understanding geometric concepts and properties. The National Council of Teachers of Mathematics (Curriculum and Evaluation Standards for School Mathematics, 1991; Principles and Standards for School Mathematics, 2000) and the National Research Council (Hill, Griffiths, Bucy, et al., Everybody Counts, 1989) have supported the development of exploring and conjecturing ability for helping students to have mathematical power. The examples of the activities built in GSP for students are designed to illustrate the ways in which van Hiele`s model can be implemented into classroom practice.