Sequence Diagram Example: Simple ATM


A sequence diagram shows objects and the messages that are passed between these objects for the particular collaboration. This is a simple sequence diagram example for ATM. It shows the interaction from inserting card to verifying account and rejecting card.

To edit this sequence diagram template, simply click on Use this Template. Afterwards, you'll be able to add and remove actors and lifelines to your liking.

What is Sequence Diagram?

A sequence diagram (sometimes called event diagrams or event scenarios) shows object interactions arranged in time sequence. Sequence diagrams are typically associated with realization of a use case scenario. A sequence diagram depicts the objects participated in a use case scenario and the sequence of messages exchanged between the objects (also called the flow of event in textual form) needed to carry out the functionality of the scenario.

How to draw Sequence Diagram

  1. Identify who starts the interactions (which actor)
  2. Describe the message exchange between actors and the business systems in textual form called flow of events
  3. Consider each of the flows in the flow of events repeatedly to identify the participating objects which are required to get the task done.
  4. Detail the message exchange between the participating object
  5. Consider the creation and deletion of object lifeline as well
  6. Review and touch up by running through the entire scenario

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