Cao Yiming is a distinguished professor in School of Mathematical Sciences at Beijing Normal University, China. He is also the leader of the revision group of compulsory education mathematics curriculum standard. During the past twenty years, he has explored how to support students' mathematics learning through teachers' development of high-quality instructional practices. He has worked with different school systems and teachers throughout China, the USA, Australia, Japan, Finland, and Germany. He also has research collaborations with scholars from the UK, Austria, Hungary, and Singapore. In 2018, he published a book The 21st Century Mathematics Education in China (Springer), which was co-edited with Frederick K.S. Leung and provided a comprehensive introduction to the status of development of Chinese mathematics education in the twenty-first century.

• Introduction.- Chapter 1. Examining junior high school students’ collaborative knowledge building based on the comparison of high & low performance groups’ mathematical problem-solving.- Chapter 2. An investigation of student participation in a collaborative task in mathematics: Positioning and negotiation among four Chinese students.- Chapter 3. Research of individual authority and group authority relations in collaborative problem solving in middle school mathematics.- Chapter 4. A study on the characteristics of mathematical communication in junior high school students’ collaborative problem solving.- Chapter 5. A study of conflict discourse in mathematical collaborative problem solving.- Chapter 6. Research on Student Interaction in Peer Collaborative Problem Solving in Mathematics.- Chapter 7. Differences between experienced and preservice teachers in noticing students’ collaborative problem-solving processes.- Chapter 8. Teacher intervention in collaborative mathematics problem solving in secondary school.- Chapter 9. Research on the evaluation of students’ collaborative problem solving.