Childhood Apraxia of Speech vs Phonological Disorder

• CAS: inconsistent errors (same words said differently each time) vs Phonological: consistent errors
• CAS: often have vowel errors vs phonological: rarely have vowel errors
• CAS: errors increase as utterance length increases vs Phonological: consistent errors
• CAS: automatic or well rehearsed speech is much easier vs Phonological: all speech equally hard
• CAS: rate, rhythm and stress of speech is disturbed vs Phonological: is not

Links:  http://www.apraxia-kids.org/library/a-comparison-of-childhood-apraxia-of-speech-dysarthria-and-severe-phonological-disorder/