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Place Order Sequence Diagram

Run the Sequence Diagram MicroSim Fullscreen

About This MicroSim

A canonical UML sequence diagram for placing an order across five participants — Customer, Web Frontend, Order Service, Inventory Service, Payment Gateway. Toggle between the payment-succeeds and payment-fails branches of the alt fragment. Click Show Timing to overlay realistic latency budgets on each message — the diagram now does double duty as a performance-budget conversation.

Lesson Plan

Learning Objectives

By the end of this activity, students will be able to:

  1. Read a UML sequence diagram and identify each participant
  2. Distinguish synchronous from return messages
  3. Trace both branches of an alt combined fragment
  4. Read approximate latency budgets at each message arrow