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A dependency is a type of relationship that signifies that one element, or group of elements, acting as the client depends on another element or group of elements that act as a supplier. It is a weak relationship that denotes that if the supplier is changed the client may be affected. It is a unidirectional relationship.
Procedure for creating dependency
In order to create dependency, click [Toolbox] -> [UseCase] -> [Dependency] button, drag element and drop to other element depended.
Procedure for creating other usecase depended by current usecase
Enter with "-->" string at the quick dialog as following.
So dependency relationship is created between two elements.