Using the analogue models of the caldera inferred by the Biwako Cauldron located over southern Shiga prefecture, the lesson practice of the observation was performed in an upper secondary school earth science class. In the lesson, students observed the analogue models of caldera formation and they discussed how the shape of caldera was formed. The changes of the understanding of the contents by students were examined through "Concept Mapping", and protocol in discussion and questionnaire method. As the result, further understanding about the formation process of a caldera was promoted, whic...