This study used a single-case design to investigate the effectiveness of Daily Behavior Report Cards (DBRC) in addressing elementary school children's disruptive behavior. The study, conducted in a German elementary school, involved ten second-grade students identified by their teachers as exhibiting disruptive behaviors. The procedures included training teachers in the implementation of DBRC, setting specific behavioral goals for each student, and using the Direct Behavior Rating (DBR) to assess General Disruptive Behavior (GDB) and Specific Goal Behavior (SGB). The DBRC was implemented over 120 days, with daily monitoring and feedback provided to students. The results demonstrated a significant reduction in both variables. The data analysis was conducted using regression-based analyses and the Non-Overlap of All Pairs (NAP). This study confirms the effectiveness of DBRC in mitigating disruptive behaviors and achieving specific behavioral goals, thereby contributing valuable insights into the application of this evidence-based intervention within the German elementary school system. It also highlights the utility of the single-case design in educational research.