Answer
You should probably add an arrow indicating that ControlGame must
tell UpdateScore who won the volley and another arrow in the other
direction indicating that UpdateScore will report the current status
(such as “set over” or “match over”) when it returns control to
ControlGame.
Work Step by Step
You should probably add an arrow indicating that ControlGame must
tell UpdateScore who won the volley and another arrow in the other
direction indicating that UpdateScore will report the current status
(such as “set over” or “match over”) when it returns control to
ControlGame.
