The Daily Behavior Report Card is an intervention showing promise in various formats and in multiple settings. A meta-analysis evaluated the size of effects obtained from Daily Behavior Report Card interventions within single case research designs, investigating six potential moderators of treatment effects: student age, target behavior, home/school collaboration, breadth of use, scale construction, and reliability measure. Effect sizes are based on the improvement rate difference, a new overlap-based summary. Overall, data yielded 48 separate effect sizes from 17 studies. The mean improvement rate difference for all studies was 0.61 with a range of -0.15 to 0.97. This wide range of scores highlights the need to consider specific aspects of implementation to improve outcomes. High levels of home involvement and broad use throughout the day are associated with stronger intervention outcomes. (Contains 2 tables.)