How to create a behavioral model in software engineering?

While other analysis modeling elements provides a static view of the software, behavioral modeling depicts the dynamic behavior. The behavioral model uses input from scenario based, flow oriented and class based elements to represent the states of analysis classes and the system as a whole. To accomplish this, states are identified, the events that cause a class to make a transition from one state to another are defined, and the actions that occur as transition is accomplished are also identified. State diagrams and sequence diagrams are the UML notation used for behavioral modeling.

The behavioral model is an indication showing how a software responds to external event. Steps to be followed are:
- All use cases are evaluated.
- Events are identified and their relation to classes are identified.
An event occurs whenever the system and an user exchange information. An event is not the information that is exchanged but a fact that information has been exchanged.

- A sequence is created for use-case.
- A state diagram is built.
There are two different characterizations of states in behavioral modeling : state of class as system performs its function and the state of the system as seen from outside. The system has states that represent specific externally observable behavior whereas a class has states that represent its behavior as the system performs its functions.
- Behavioral model is reviewed for accuracy and consistency.