In this paper, we demonstrated an evidence-based action research in an introductory programming class with the use of an information dashboard which provides coding metrics to visualize students’ engagement of their assignments. The information dashboard was designed for teachers to improve their classroom teaching using the same coding metrics which was verified in our previous research [9]. The system was equipped with a cross-filter functionality for exploring the entire classroom metrics. Accordingly, teachers can easily conduct a temporal analysis, an across-year comparison, and a cross metrics analysis. We examined the system for the improvement of the 5th year course using a dataset from the past four years from a non-CS introductory programming course at a university. Qualitative analysis was conducted using the discourse between teachers and teaching assistants with the proposed dashboard. The results showed that the system succeeded in promoting discourse, which included a clearer understanding of the class and its improvement, such as teaching method, assignments, or of students’ behavior.