Receptive and expressive wh-question performance by language-delayed children.

The receptive and expressive wh interrogative performance of language-delayed children was investigated. Results indicated a series of response strategies and expressive performance strikingly similar to normal children in the early stages of language acquisition. These results suggest that the delayed children develop the same order of acquisition and rules for questioning as normal children, but at a slower rate. Therapeutic activities should therefore follow the order of interrogative development presented in the normative research.