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Thank you for reading me.
The diagram I have to draw is a classes diagram.

The situation is the following:
suppose there are only two ways in which one can pay for something somewhere:
- with a credit card (attributes: number and date),
- with a cheque (attribute: number).

Suppose there is one type of payment per bill.
Suppose there is a BILL class.

I was thinking about creating three classes:
- PAYMENT (no attributes),
- PAYMENT_BY_CREDIT_CARD (attributes: number, date),
- PAYMENT_BY_CHEQUE (attributes: number)
with PAYMENT_BY_CREDIT_CARD and PAYMENT_BY_CHEQUE
being sub-classes of PAYMENT.

I am a beginner, I sincerely don't know how to represent this situation, please help me.

Thanks a lot in advance.
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Les]]> http://forums.visual-paradigm.com/posts/2054#16567.html http://forums.visual-paradigm.com/posts/2054#16567.html
A solution that was exposed to me makes of:
-> PAYMENT an abstract class,
-> and PAYMENT_BY_CREDIT_CARD and PAYMENT_BY_CHEQUE
two subclasses of the PAYMENT class.

For PAYMENT, in ArgoUML, a class was created with no attributes and a stereotype <>.

For PAYMENT_BY_CREDIT_CARD was created a class with two attributes: number and date.

For PAYMENT_BY_CHEQUE was created a class with one attribute: number.

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