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“Lesson study” has garnered considerable attention from educational researchers and practitioners as a promising method for improving instruction. At its core, lesson study reflects a collaborative inquiry process, grounded in cycles of planning, enacting, and reflecting, that promotes teacher learning through active engagement in lesson refinement. In this article, we leverage lesson study as an exemplar case to foreground an examination and application of theory-based evaluation. We overview a novel evaluation framework contextualized to this multidimensional instructional program and draw out the contributions of theory-based evaluation to the study of program effects. To ground the description of this framework, we summarize representative findings from our ongoing evaluation of a lesson study-based instructional program and discuss processes for selecting, using, and managing evidence sources as well as determining causal strands supporting program outcomes. We conclude by discussing lessons learned and implications for theory-based evaluation of complex programs. 

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.