c) At or passing an agreed level,<br>

d) While the aircraft is climbing or descending to a previously agreed level provided that the transferring controller has ensured that standard separation will exist between the transferred aircraft and all others for the remainder of the climb or descent. <br>

[[File:Example-of-transfer-of-commmunication-and-transfer-of-control.png|Illustration of Transfer of control and Transfer of Communication]]