text=An activity graph is a model element that represents a specialized view of a state machine. An activity graph is different from a state machine because activity graphs may contain activities and swimlanes. Activity graphs and state machines are closely related and use all other state machine model elements. You use activity diagrams to represent an activity graph. Activity diagrams model flow between concurrent and sequential activities (steps) in a process. Activity graphs are helpful because they describe the states of an activity or process involving one or more classifiers.