"Articulation refers to the totality of motor movements involved in production of the actual sounds that comprise speech (Bauman-Waengler, 2009). The learning of articulatory skills is a developmental process involving the gradual acquisition of the ability to move the articulators (those structures that are important in forming the individual sounds) in a precise and rapid manner. Thus, learning to articulate is a specific kind of motor learning."

(Bauman-Waengler, 2020, p. 4)

"Study of sound the system in a language; examines the sound units of that particular language, how these units are arranged, and their systematic organization and rule system."

(Bauman-Waengler, 2020, p. 449)