I am currently doing my research with a focus mainly on learning sciences, visualization of math class discourse, and practice items. And the specific groups are primary school preservice and novice math teachers. My past research experiences laid primarily on quantitative analysis of International Large-Scale Assessments like PISA, especially about ICT competence of teachers, and applications of education measurements such as Item Response Theory (IRT) and Cognitive Diagnostic Models (CDMs). If you are interested in these topics, cooperation and sharing of brilliant insights are always warmly welcome. I always believe that the research works that we are doing and will do are supposed to make some IMPACT to educators or society.