Abstract
This study investigated the learning of K–8 preservice teachers (PTs) while enrolled in an in-person class that was integrated with an online, individualized, and interactive Dynamic Geometry curriculum (iDGi), built from empirically derived learning progressions (LP). The research examined PTs’ developing understanding of the prototypical defining properties of quadrilaterals—formal geometric attributes that align with the visually salient features students often use when identifying and reasoning about quadrilateral types and their relationships. It also explored how the curriculum supported PTs’ transition toward more precise and abstract forms of reasoning. The curriculum’s effectiveness was evaluated with 541 PTs across multiple courses, all of whom completed identical online multiple-choice LP-based assessments before and after engaging with iDGi. Findings indicated that iDGi significantly improved PTs’ reasoning about quadrilaterals. Analyses of three whole-class discussions illustrated how related in-class activities complemented and deepened PTs’ conceptual understanding.
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Article Type: Research Article
INT ELECT J MATH ED, Volume 21, Issue 4, November 2026, Article No: em0896
https://doi.org/10.29333/iejme/19419
Publication date: 25 Sep 2026
Online publication date: 01 Oct 2026
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