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A “system” is like a “family”. A family is a system.

A family can be a human family or an animal family.

It is not important what makes up a family,

what is important is that what makes up a family acts like a family.

A family is a whole made of the parts of a family.

The parts of a family are related.

What is important about a family is how we talk about the family.

Most of the time we talk about Bill or Jane or Bob.

But in a family we talk about mother or father or son

So the language of a system is about the relationships within the family.

We can also talk about friends or buddies.

That way we know what is in the family and what is not.