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A goal model showing a student deciding what to have for lunch

Goal Models are diagrams like the one shown above that are used to understand the goals and evolutions of goals of stakeholders.

Intentions are the nodes or elements in a goal model such as Have Lunch in the example. There are four types of intentions in TROPOS (the modeling language we use), goals, soft goals(not shown), tasks, and resources.

Links connect intentions to show relationships. The labels on the link between two intentions can change the relationship. For example a ++ link indicates that in order for one intention to be satisfied, it is essential that the other one is.

Actors are used to group together a network of intentions. In the above example Student and College are actors

Evidence Pairs are the basis for evaluating the satisfaction of goal models. They consist of evidence for the satisfaction of intentions, as well as evidence against satisfaction of an intention. This provides an interesting possibility for evidence for satisfaction as well as evidence against, creating a conflict.

Functions can be assigned to intentions to dictate how its evidence pairs evolve over time after a single path has been simulated.



Single Path Simulation

Explore Possible Next States