We taught 2 4-year-old children with autism to ask questions of an adult wh
o held a closed box with a toy inside. The treatment package (modeling, pro
mpting, and reinforcement) was evaluated with a multiple baseline design ac
ross the three question forms during training, generalization, and follow-u
p evaluations. The first question form ("What's that!") produced the name o
f the hidden item. The second form ("Can I see it!") produced sight of it,
and the third form ("Can I have it'") produced the item itself. Both childr
en learned to ask questions about hidden objects.