Abstract
A series of studies exemplifying the interpersonal orientation of communication research are summarized. The studies under review are drawn from the field of mental retardation. The approach highlights the social character of communication and the patterns of reciprocal influence that obtain when children and adults meet in communicative situations. This approach has implications for research methodology and certain clinical procedures. In these experiments the type-token ratio was used to arrive at a quantitative measurement of communicative efficiency.

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