Sequence Diagram

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Definition: Sequence Diagram

Sequence diagram is a visual representation of various messages sent between the objects of a system and the order in which these messages occur.

Sequence diagram is an important tool to visualize the interaction between various objects of a business. It can be used to model both existing procedures as well as planned procedures for future. It is a formal way of assisting developers who are designing the system by giving them a clear picture of how the entire system should work in real time.

The important elements in a sequence diagram are –

Lifelines: These are the objects or actors participating in a sequence diagram

Messages: represent the communication occurring between the objects. The messages are represented by horizontal arrows between the objects.

Solid arrow with solid head - represents synchronous message from sender to receiver

Solid arrow with stick head – represents asynchronous message from sender to receiver

Dotted arrow – represents response signal from receiver to sender.

Let’s consider an example of sequence diagram for an ATM transaction between a user and ATM machine.

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