Here we show a Student object with four components (ivars).

The "has-a" relationship test is helpful to identify components:

• Student has-a name
• Student has-a major
• Student has-a advisor
• Student has-a list of courses

All of these "has-a" statements sound reasonable, so we would know we are on the right path using components (ivars).

Here we show a Car object with three components (ivars).

Here we show a Team object with two components (ivars).

Also see composition over inheritance....