According to the ASHA 2007 document, the 3 core characteristics of CAS are:

a) "Inconsistent errors, difficulty with motor planning, and limited speech sound repertoire."
b) "Delayed speech development, difficulty with language comprehension, and frequent articulation errors."
c) "Impaired fluency, limited vocabulary, and difficulty in syntax formation."
d) "Auditory processing challenges, rapid speech rate, and difficulty in voice modulation."