Although reflective practice is recognised as a driver of instructional change, technology-focused professional development—particularly one-shot tool workshops—often lacks systematic analysis of student evidence, prioritising technical skills over evidence-based reflection. This study aimed to empirically develop and refine a technology integration competency framework for mathematics teachers by investigating how structured reflective practice serves as a mechanism for longitudinal development. Adopting a design-based research (DBR) approach, the study was conducted over 18 months with 21 in-service mathematics teachers in northern Thailand through two iterative cycles of design, enactment, analysis, and redesign. The intervention utilised structured tools, including guided reflective journals, classroom video reflection, and reflective dialogue, enabling teachers to connect pedagogical intentions with evidence of student response. Thematic analysis indicated that the initial framework required reconfiguration into a dynamic model characterised by three structural shifts: the merger of technological knowledge and tool proficiency into a single fundamental technology competency; the reclassification of teacher confidence as a transversal element; and the central positioning of flexible learning design for blended orchestration. These thematic findings were validated through data triangulation of journals, video reflections, and interviews. The study contributes an empirically warranted framework with actionable implications for designing professional development that fosters sustained instructional improvement in mathematics.
Jun-on et al. (Tue,) studied this question.