Discrete trial training is a popular teaching method for individuals with autism, but is not easily implemented with fidelity due to its complexity. This is the first meta-analysis of single-case experimental design studies to quantify the impact of behavioral skills training on individuals' ability to implement discrete trials with fidelity. Furthermore, this metaanalysis examines the four training methods that make up behavioral skills training--feedback, instruction, modeling, and rehearsal--to determine the "active ingredients" of behavioral skills training. A total of 46 single-case experimental design studies are included in this meta-analysis. Hierarchical linear modeling, which has the ability to analyze clustered data, is the meta-analytic technique used to estimate the effectiveness of behavioral skills training across studies. Results show that behavioral skills training has a statistically significant positive effect on discrete trial training implementation fidelity; therefore, behavior skills training is recommended for discrete trial training implementation instruction. [This is the online version of an article published in "Focus on Autism and Other Developmental Disabilities." For the final published version of this article, see EJ1355629.]