Fueled by the on-going demand for evidence-based practice in the field of speech-language pathology, this study examines the efficacy of an explicit, rule-based child language intervention. Sixteen children with language impairment between the ages of 6 and 8 were taught a novel grammatical morpheme through either the presentation of the rule guiding the novel form coupled with models (explicit condition) or only the presentation of models (implicit condition). The novel form was presented via computer across four days. The children’s production of the novel form was evaluated immediately following training and 3-4 days post-training. Results indicate that the children who received the explicit intervention were able to produce the novel morpheme with greater accuracy than the children who received the implicit intervention immediately after training. There were no treatment differences in the children’s production 3-4 days post-training. These findings support the continuation of research examining explicit interventions for children with language impairment.