Introduction to the papers of TWG23: Implementation of research findings in mathematics education

In this introduction, we briefly present the origin of a young Thematic Working Group 23 (TWG23) on implementation of research findings in mathematics education, and its development from CERME 10 to CERME 11. We then address the construct “implementation research” by looking at the model proposed by Century and Cassata (2016). Drawing from this model, we attempt to categorize the papers and posters of TWG23. In addition, we report on the results from two thematic discussions that focused on the topic of “Methodology in implementation research” and “Replication studies”. Lastly, we offer a collective, still in-progress definition of implementation research as a result of the summarizing discussion in the TWG23 during CERME 11.