This Interaction Diagram Model depicts the message sequence for the SpecialOrder object, which can also be used for the NormalOrder object. It is critical to comprehend the time sequence of message flows. The message flow is nothing more than an object's method call. The first call is to send order (), a method of the Order object. The next call is to confirm (), a special order object method and the last call is dispatch (), which is also a special order object method. The diagram below primarily describes method calls from one object to another and represents the actual scenario when the system is running. Method calls are analogous to sequence diagrams. The sequence diagram, on the other hand, does not.
