![]() Figure 1 depicts a UML sequence diagram for the Enroll in University use case, taking a system-level approach where the interactions between the actors and the system are shown. ![]() This includes web-services as well as business transactions implemented by a variety of technologies such as CICS/COBOL or CORBA-compliant object request brokers (ORBs). A service is effectively a high-level method, often one that can be invoked by a wide variety of clients. One way to think of sequence diagrams, particularly highly detailed diagrams, is as visual object code. Sequence diagrams can be used to explore the logic of a complex operation, function, or procedure. For example, a student enrolls in the university, and then immediately enrolls in three seminars. The logic of a usage scenario may also be a pass through the logic contained in several use cases. It may also be one entire pass through a use case, such as the logic described by the basic course of action or a portion of the basic course of action, plus one or more alternate scenarios. The logic of a usage scenario may be part of a use case, perhaps an alternate course. A usage scenario is a description of a potential way your system is used. Sequence diagrams, along with class diagrams and physical data models are in my opinion the most important design-level models for modern business application development.Sequence diagrams are typically used to model: Other dynamic modeling techniques include activity diagramming, communication diagramming, timing diagramming, and interaction overview diagramming. ![]() Sequence diagrams are the most popular UML artifact for dynamic modeling, which focuses on identifying the behavior within your system. UML Sequence Diagrams: An Agile Introduction UML sequence diagrams model the flow of logic within your system in a visual manner, enabling you both to document and validate your logic, and are commonly used for both analysis and design purposes.
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