An adapted alternating treatments design was used to compare mother-developed and delivered social stories and video modeling in teaching social skills to children with autism spectrum disorder (ASD). Mothers’ opinions about the social validity of the study were also examined. Three mother–child dyads participated in the study. Results showed that mothers could develop social stories and video images with 100% accuracy and implement them with high treatment integrity. Results also showed that both interventions were effective in teaching social skills to children with ASD, and both mothers and children could maintain and generalize their acquired skills; video modeling was more efficient for two children and social stories were more efficient for one child. Finally, mothers’ opinions about the social validity of both interventions were positive. Future research is needed to support these findings.