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Incidental language teaching refers to interactions between an adult and a child that arise naturally in an unstructured situation and are used systematically by the adult to transmit new information or give the child practice in developing a communication skill. The purposes of this paper are to review and critique current research on incidental language teaching, briefly discuss the theoretical reasons why incidental teaching might be expected to be effective, and to discuss directions for future research on this teaching approach with children who are language impaired and mentally retarded.
Warren et al. (1986) studied this question.