Introduction to the papers of TWG20: Mathematics teacher knowledge, beliefs, and identity: Some reflections on the current state of the art

In this introductory chapter for the Thematic Working Group " Mathematics teacher knowledge, beliefs, and identity " (TWG20) at CERME9, we address the main issues discussed during our working sessions. We aim to provide a critical and broader view on the work being done, including the work undertaken at previous conferences , although not extensively. We also seek to take a new look at areas of potential improvement with regard to the focus of, discussion about, and problems inherent to research in the area of teacher knowledge, beliefs and identity, all with the goal of improving teacher education and practices. This paper brings to the forefront some critical features of this area of research and aims to contribute to the genesis of a new focus on our research and a new vision of our own roles as researchers and teacher educators.