Vulnerability is implied with Dependency Link(s). The dependency link represents that the depender, by depending on the actor who is the dependee, is able to achieve goals that it was not able to achieve before, or not as well, or not as quick. However this results in the depender becoming vulnerable to the intentions of the dependee. This vulnerability is implied because the dependee may fail to accomplish the specified element.
The model distinguishes three degrees of strength for the dependency according to the level of vulnerability. These types of dependencies apply independently on each side of a dependency. They are described in the following:
- Open dependency (uncommitted): Not obtaining the dependum would affect the depender to some extent but not seriously. This dependency strength is represented by including an "O" on the appropriate side of the link.
- Committed dependency: Not obtaining the dependum would cause some action for achieving a goal to fail in the depender.
- Critical dependency: Not obtaining the dependum would cause all actions to fail that the depender has planned to achieve a goal. This dependency strength is represented by including an "X" on the appropriate side of the link.
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