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For years, teacher educators have experimented with using videos to supplement and improve teacher candidates’ overall preparation. However, little is known about how such materials are developed and improved over time, especially in the early stages of development. The VBX project is a design-based research project focused on developing an online video-based intervention to improve secondary mathematics teacher candidates’ ability to attend to student thinking. We describe the theoretical underpinnings of the project and how iterative development cycles led to a more streamlined design and clearer learning goals. Our work provides a much-needed example of how to conduct iterative cycles of improvement during the initial phase of curriculum development and how such work impacts curriculum design.