This is designed to teach a student to judge whether or not it is necessary to tap someone on the shoulder to get their attention and do so, if necessary.
This is designed to teach a student by demonstration and explanation how to get someone’s attention if they do not respond to an initial call of their name.
This is designed to teach a student to call someone’s name to get their attention before asking that person to play. The person being asked starts to fade the obviousness of cues in their responding.