The Use Case diagram enables modelling of a business view of the scenario, the Sequence diagram contains implementation details of the scenario, including the objects and classes that are used to implement the scenario, and messages passed between the objects (Ambler, 2012).Īs per the sequence diagram (given below) of the online Flight Reservation System and the definition of the sequence diagram, the actors that were identified in Use Case Diagram (customer, website) has been utilized in the Sequence Diagram. Moreover, it also represents the services provided by the system to their clients, for example, the web services i-e online flight reservation system. The sequence diagrams are used to describe the complicated operations, methods or functions in graphical or pictorial mode. The Sequence diagrams are used to model the usage scenario of the system, the logic of the methods and logic of the service. It is pertinent to mention here that we have to develop / draw a Sequence diagram for each and every Use Case. The Sequence diagram is one of the most usable and useful diagrams to represent the interaction of one or more objects’ interactions with one or more systems.

The sequence diagram is a tool of Unified Modelling Language (UML) that represents the interaction of different actors with the system in order to get a result/response (Bell, 2004). The sequence diagram is a critical part utilized in procedures of analysis and design documentation of user requirements.

Sequence diagram online airline ticket