Articulation Disorders - errors (e.g., distortions and substitutions) in production of individual speech sounds

Phonological Disorders - predictable, rule-based errors (e.g., fronting, final consonant deletion) that affect more than one sound

Childhood Apraxia of Speech (CAS) - a motor speech disorder involving problems with planning and coordinating speech movements

Receptive Language Disorders - occur when a child has difficulty understanding what others say.

Expressive Language Disorders - occur when a child has problems sharing thoughts, ideas, and feelings.