See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/280301687 TEXTBOOK SIGNATURES: AN EXPLORATORY STUDY OF THE NOTION OF GRADIENT IN GERMANY, SINGAPORE AND SOUTH... Conference Paper · July 2015 CITATION 1 READS 47 3 authors: Some of the authors of this publication are also working on these related projects: Portraits of Teacher Noticing during Orchestration of Learning Experiences in the Mathematics Classrooms View project Snapshots of Teacher Noticing (PhD Project) View project Ban Heng Choy Nanyang Technological University 8 PUBLICATIONS 10 CITATIONS SEE PROFILE Mi Yeon Lee Arizona State University 22 PUBLICATIONS 14 CITATIONS SEE PROFILE Angel Mizzi University of Duisburg-Essen 1 PUBLICATION 1 CITATION SEE PROFILE All content following this page was uploaded by Ban Heng Choy on 23 July 2015. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.