1. Reasoning Dynamically About the Area of a Rectangle: The Case of Lora and Isaac

   • Nicole Panorkou

   OriginalPaper 11 August 2020 Pages: 257 - 292

   

2. Characterizing Learners’ Growth of Geometric Understanding in Dynamic Geometry Environments: a Perspective of the Pirie–Kieren Theory

   • Xiangquan Yao

   OriginalPaper 31 May 2020 Pages: 293 - 319

   

3. The Use of 3D-Printing Technology in Calculus Education: Concept Formation Processes of the Concept of Derivative with Printed Graphs of Functions

   • Frederik Dilling
   • Ingo Witzke

   OriginalPaper Open access 16 April 2020 Pages: 320 - 339

   

4. Opportunities for Reasoning: Digital Task Design to Promote Students’ Conceptions of Graphs as Representing Relationships between Quantities

   • Heather Lynn Johnson
   • Evan D. McClintock
   • Amber Gardner

   OriginalPaper Open access 28 February 2020 Pages: 340 - 366

   

5. Instrumental Genesis Stages of Programming for Mathematical Work

   • Chantal Buteau
   • Eric Muller
   • Kirstin Dreise

   OriginalPaper 21 February 2020 Pages: 367 - 390