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Theoretical Basis: The van Hiele Model
Theoretical Framework: Learning as Communicating, Sfard's Discursive Framework, and the Levels of Geometric Discourse
Methodology: Participants, the van Hiele Geometry Test, Interview Tasks
Data Collection and Analysis
Results from the van Hiele Geometry Test and One-on-One Interviews
Changes in van Hiele Levels and Changes in Geometric Discourse.

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