Recent research has suggested that eliciting diadochokinetic (DDK) rate and accuracy in young children is difficult, with analysis being time-consuming. This paper details a new protocol for assessing DDK in young children or children with intellectual impairment (Downs syndrome) and a method for calculating accuracy scores automatically. Accuracy scores were calculated from auditory and electropalatographic analyses and found to correlate in some instances. The children with Downs syndrome presented with similar DDK rates to typically-developing children but reduced accuracy.