This study introduces Video Study Group(VSG) as a way of improving teachers' teaching skills, attitudes, and professional knowledge. VSG is a type of video conference among teachers and researchers that can provide teachers video feedback, which, then, makes the teachers look back on what they performed in the classroom. As a case study, this study focuses on a VSG where a teacher reflected on her use of overhead projection (OHP) in terms of the rationale for her choice of OHP as a pedagogical instrument, and her perception of and reflection on the actual usages of OHP in her class. As a theoretical framework, this study adopted Functional VSG and the research protocol suggested by Tochon (1999), and the analytic framework called the Stimulated Recall process (Gass & Mackey, 2000). The main discussions of this study are: I) the application of the Stimulated Recall process to VSG practices, ii) the structure of a Functional VSG, and some key tasks of a VSG where discussions are provided to facilitate teachers' recall and to prompt them to think of appropriate solutions, iii) the investigation of teachers' intentions, strategies, or rationales for their actions in each of the introspect, retrospect, and prospect phases. In short, this paper highlighted three pedagogic merits of VSG: it helps teachers to construct or reconstruct their professional vision, prompt diverse sense-making strategies from their own teachings, and deepen their knowledge as classroom teachers. VSG can be a powerful research tool for teacher-researchers who are interested in studies of educational methodology.