The goal of this research programme was to evaluate the role of word lexicality in effecting phonological change in children's sound systems. Four children with functional speech sound disorders (SSDs) were enrolled in an across-subjects multiple baseline single-subject design; two were treated using high-frequency real words (RWs) and two were…

This single-subject case study evaluates effects of treatment of a complex onset on the sound system of a monolingual Spanish-speaking child (female, aged 3;9) with phonological delay. Pretreatment, the child excluded all consonant+liquid clusters, as well as [the alveolar tap] and trill /r/. Immediately following training on [using the alveolar…