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Article History

Received: 22 June 2018

Accepted: 6 November 2018

First Online: 28 November 2018

Authors’ information

: Sven Schueler (M. Ed.) studied mathematics and social science and is currently working on his PhD thesis concerning teachers’ knowledge and conceptual images of probability and statistics. He works as a research associate with Prof. Dr. Bettina Roesken-Winter at the Humboldt-Universität zu Berlin. In his research, he is primarily concerned with teachers’ and facilitators’ noticing of crucial incidents of mathematics learning on the classroom level and the PD level.Bettina Roesken-Winter holds a professorship for design-based research at the Humboldt-Universität zu Berlin. She is the leader of the department C of the German Center for Mathematics Teacher Education (DZLM), and in this role she is responsible for the center’s research program. Her main research interests concern the design of mathematics teachers’ and facilitator’ PD, the role of specific design elements, and their influence in term of sustainability.

: All participants have been informed prior to our study and gave consent to participate.

: The participants of our study and the teachers’ in the video cases gave consent for publication.

: The authors declare that they have no competing interests.

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