Among social skills that are core symptoms of autism spectrum disorder, turn-taking plays a fundamental role in regulating social interaction and communication. Our main focus in this study is to investigate the effectiveness of a robot-enhanced intervention on turn-taking abilities. We aim to identify to what degree social robots can improve turn-taking skills and whether this type of intervention provides similar or better gains than standard intervention. This study presents a series of 5 single-subject experiments with children with autism spectrum disorder aged between 3 and 5 years. Each child receives 20 intervention sessions (8 robot-enhanced sessions--robot-enhanced treatment (RET), 8 standard human sessions--standard human treatment, and 4 sessions with the intervention that was more efficient). Our findings show that most children reach similar levels of performance on turn-taking skills across standard human treatment and RET, meaning that children benefit to a similar extent from both interventions. However, in the RET condition, children seemed to see their robotic partner as being more interesting than their human partner, due to the fact that they looked more at the robotic partner compared with the human partner.