Note: To protect the confidentiality of the participants, pseudonyms have been used. CDI, MacArthur Communication Development Inventory: Words and Sentences (Fenson et al., 1993); I-ASCC, Index of Augmented Speech Comprehensibility in Children (Dowden, 1997); TACL-3, Test of Auditory Comprehension of Language, 3rd Edition (Carrow-Woolfolk, 1999).aCAS, Childhood apraxia of speech.