The ability to say sounds correctly.
Sounds emerge in a developmental pattern.
The ability to use an appropriate vocal quality, intensity, pitch and inflection. Vocal intensity involves judging whether a student's voice is too loud or too soft. Vocal pitch involves judging whether a student's voice is too high or too low. Vocal inflection involves judging whether a student can vary the inflection of his voice. The ability to sustain a smooth, fluent speech pattern.