© 2015 EDAM.The aim of the current study was to compare simultaneous prompting (SP) and constant time delay (CTD) in terms of their effectiveness and efficiency in teaching children with autism how to respond to questions about personal information. The adapted alternating treatments model was used in the study. Three male students with autism aged 4, 6, and 9, respectively, were included in the study. The findings of the study did not indicate any significant difference in two students with respect to the effectiveness of SP and CTD procedures. On the other hand, SP was observed to create more positive results and lead to a higher level of learning for the third participant. According to the findings, SP was more effective for one participant with respect to all the parameters studied. While SP was more efficient in the other two subjects in terms of incorrect responses, the difference regarding the instructional time to criterion for these two subjects was at a minimal level in favor of SP.