Association
uses-a · plain line
Driver
whole
———›
Car
part
Driver knows a Car. Neither owns the other.
Destroy the whole
Aggregation
has-a · hollow ◇
Team
whole ◇
◇————
free pool — players that exist on their own
(empty)
Team has shared Players. They can outlive the team.
Destroy the whole
Composition
owns-a · filled ◆
House ◆————
House owns its Rooms. They're built inside it.
Destroy the whole
console
Reset
▸
Ask one question:
what happens to the part when the whole is destroyed?
The car lives, the players escape, the rooms die.