This study examined technological pedagogical content knowledge change of middle school mathematics teachers who participated in a professional development program designed to integrate technology into teaching algebra. Twenty-eight middle school teachers from 20 different schools participated in the study. The data collection tools were technological pedagogical content knowledge survey, reflective journals, lesson plans, and program evaluation forms. The data analysis showed that the participants’ technological pedagogical content knowledge increased significantly. In addition, participants wrote lesson plans that included effective use of technology to teach algebra contents. The positive effects of the professional development program seem to be related to the following components of the program: the usability of the program activities in middle school classrooms, program’s focus on using technology in teaching algebra, the introduction of new technological tools and software related to mathematics, and the interactive nature of the program.
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