In this study, we used a two-dimension matrix to externalize the content of hypothesis, and the level of confidence and evidence to hypothesis. The students operated the hypothesis using Synchronous CSCL. The students were frequently switching table of experiment results to two-dimension matrix. When the successful number of experiments increased, students moved the label following the course of the axis of evidence. The students then moved the label following the course of the confidence axis when a hypothesis was confirmed by experiments. The teacher can understand the advance situation o...