Speech
When a person has speech impairment they experience difficulty with articulation and phonology. Articulation is the physical production of speech, occurring when the tongue, jaw, teeth, lips and palate form to produce sounds, syllables and words (Sunderland, 2004). An example of an articulation disorder is the substitution of ‘w’ for ‘r’, e.g. ‘wed’ instead of ‘red’ (Davis & Bedore, 2000, p. 235).
These authors also define Phonology disorder as "a deficiency in the abstract system of knowledge that forms the rule system for sounds and sequences needed to convey a message in a given language"(2000, p. 235) An example of this would be a person interchanging the sound ‘ch’ for ‘sh’.
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