Sequence Diagram Example: Place Order


A sequence diagram shows object interactions arranged in time sequence. This is a typical sequence diagram for place order. It starts from the customer object that creates an order (object). And for each item chased, check the availability and add product to the order. Finally, save the order.

This simple sequence diagram example and template can be edited with Visual Paradigm Online, an online diagramming software. Click Use this Template to edit this sequence diagram template, or click Create Blank to create a new one.

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.

Key Elements in Sequence Diagram

  1. Actors are represented by human symbol
  2. Objects are represented by rectangles
  3. Classes are represented by columns
  4. Messages are represented by arrows
  5. Activations are represented by narrow rectangles
  6. Lifelines are represented by dashed lines

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