Behavioral Modeling Diagrams

Behavior diagrams capture the varieties of interaction and instantaneous states within a model as it 'executes' over time; tracking how the system will act in a real-world environment, and observing the effects of an operation or event, including its results.

Use Case diagrams are used to model user/system interactions. They define behavior, requirements and constraints in the form of scripts or scenarios. Activity diagrams have a wide number of uses, from defining basic program flow, to capturing the decision points and actions within any generalized process. State Machine diagrams are essential to understanding the instant to instant condition, or "run state" of a model when it executes. Communication diagrams show the network, and sequence, of messages or communications between objects at run-time, during a collaboration instance. Sequence diagrams are closely related to communication diagrams and show the sequence of messages passed between objects using a vertical timeline. Timing diagrams fuse sequence and state diagrams to provide a view of an object's state over time, and messages which modify that state. Interaction Overview diagrams fuse activity and sequence diagrams to allow interaction fragments to be easily combined with decision points and flows.