Study on fostering the competency of making decisions by using mathematics in the social context

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The purpose of this study was to foster “the competency of making decisions by using mathematics” among the students in Japan. This means analyzing and interpreting a situation, and making decision based on mathematical evidence. We identified a math-based judgment process, assessed the competency of the Japanese students, and developed levels of that. In addition, we developed a lesson framework that was composed of process skills, mathematical contents, mathematical support tool of choice, social values, and interaction with other students. Also, we taught eleven lessons in several elementary, junior and senior high schools, and afterwards examined the effectiveness empirically.