Abstract: Modeling as a constructive learning way can engage students in understanding some phenomenon and expressing their representation to them by exploring the situation through some given objects and tools, so it can enhance students' deep understanding and flexible application of knowledge. Modeling includes exploratory mode and expressive mode, and can be divided into three different levels: quantitative, qualitative, and semi-quantitative modeling. Instructors can help students engage in some modeling activities according to their developmental levels and in some adequate supports.

Key words: modeling, constructive learning, representation