The impact of joint action-based early language intervention on the vocabulary development and socio-communicative word usage of four developmentally delayed children was investigated in this study. Results from pre- and post-intervention language samples revealed increases in vocabulary size, especially for object words, for all chil dren. Improvement in socio-communicative word usage on repeated communication tasks was variable across children, which may have been due to procedural limitations. Improvements in mother-child interaction were generally consistent with the goals of intervention.
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