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  1. Lesson study provides opportunities for teachers to collaboratively design, implement, and analyze instruction. Research illustrates its efficacy as a site for teacher learning. The setting for this article is a lesson study project involving preservice teachers, inservice teachers, and university faculty members. We supported collaborative reflection on practice among these individuals by using asynchronous and synchronous online tools and meeting protocols. Asynchronous online lesson-video review and tagging helped participants prepare to debrief about lessons they had implemented. Midway through one of our lesson study cycles, the COVID-19 pandemic occurred, eliminating opportunities to meet face-to-face for lesson debriefing sessions. In response, we developed and field-tested two protocols for online synchronous lesson study debriefing meetings. The protocols prompted conversations related to pedagogy, content, and content-specific pedagogy. After the debriefing sessions, lesson study group members reported improvements in their knowledge growth, self-efficacy, and expectations for student learning. We describe our use of online virtual tools and protocols to contribute to the literature on ways to support collaborative reflection on practice. 
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  2. Undergraduate research is increasingly prevalent in many fields of study, but it is not yet widespread in mathematics education. We argue that expanding undergraduate research opportunities in mathematics education would be beneficial to the field. Such opportunities can be impactful as either extracurricular or course-embedded experiences. To help readers envision directions for undergraduate research experiences in mathematics education with prospective teachers, we describe a model built on a design-based research paradigm. The model engages pairs of prospective teachers in working with faculty mentors to design instructional sequences and test the extent to which they support children’s learning. Undergraduates learn about the nature of systematic mathematics education research and how careful analyses of classroom data can guide practice. Mentors gain opportunities to pursue their personal research interests while guiding undergraduate pairs. We explain how implementing the core cycle of the model, whether on a small or large scale, can help teachers make instructional decisions that are based on rich, qualitative classroom data. 
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