Question

What is the usual reason for an <> relationship (shown by dashed arrow) in a use case diagram?

1) When one use case is part of two or more other use cases
2) When one use case is independent of other use cases
3) When one use case is excluded from other use cases
4) When one use case is included in other use cases

Answer 1

The usual reason for an <> relationship in a use case diagram is when one use case is included in other use cases.

Step-by-step explanation:

The usual reason for an <> relationship, shown by a dashed arrow, in a use case diagram is when one use case is included in other use cases. This indicates that the included use case is a part of the behavior of the including use case.

For example, if we have a use case diagram for an online shopping system, the 'Make Payment' use case may be included in the 'Place Order' use case. This means that making a payment is a part of placing an order.

Therefore, the correct option is 4) When one use case is included in other use cases.