Single subject studies analyze individual behavior identifying how interventions change behavior. Critical to this analysis are repeated baseline measures to identify behavior function and evaluate intervention effects. 40 studies treating child behavior problems between 1997 and 2015 were analyzed. Average student age was 8 years. Most studies used simple frequency counts (47%) of behavior. Baseline observation averaged 42 minutes and 7.4 observations. Most studies (81%) reported no systematic analysis of baseline stability, making it difficult to establish evidence-based effective interventions