As a science. Speech therapy is involved with the prevention, evaluation and therapy of disorders in communication (lexical or not) and speech (written or oral) of children, adolescents and adults.
Specifically:
- Articulation disorders
- Speech disorders (coherence, stuttering, inarticulation, etc
- Aphasia, dysphasia in children and adults
- Neurological disorders of speech (e.g. inarticulation)
- Linguistic negativity
- Delayed linguistic development