The 21st Century COE Program “Integrative mathematical science : The development of mathematics through the analysis of a phenomenon” is aimed at developing mathematical science in an integrative manner, by centering on basic mathematics and using both data science, which plays a role in interface to a phenomenon, and experimental mathematics, which is in charge of experimental aspects, as “Two wheels of one cart”. And, with that, we aim to become a hub for educational research that leads the world.