Sequence Diagram

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The problem with many Unified Modeling Language (UML) educational texts is that they present the various concepts each in isolation; so you see a use case diagram for one problem domain, a class diagram for an entirely different problem domain, and you never get to see the important traceability between the diagrams.

In this case study we aim to put it right by working through a single problem from use cases and activity diagrams, through sequence diagrams and state diagrams, to class diagrams and component diagrams. We have arranged the case study as three distinct perspectives or aspects as follows.

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A UML Sequence Diagram is used most commonly to show the realization of a use case in terms of interactions between business entities or software objects. This diagram therefore helps with the transition from non-object oriented activity diagrams and use case diagrams to the object-oriented paradigm of modern software development.
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This is a complete example of a Business/Systems Analysis Model using UML and including: Use Cases, Activity Diagrams, Context Diagram, and more.
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Almost every business analyst uses diagramming software in their arsenal of analysis tools. According to BABOK 2.0, an analyst’s traditional purpose in using diagramming tools is to “support the rapid drawing and documentation of a model, typically by providing a set of templates for a particular notation which are used to develop diagrams based on it.” Diagrams not only make requirements clearer to stakeholders through modeling, they help clarify an analyst’s thinking on a project through the process of their very creation.

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“Where does UML fit?” is a common question among new (and not so new!) business analysts. We all know that the M stands for modelling but beyond this, perceptions start to differ. In its current form (V2.0) UML consists of 13 diagram types all of which provide a different view of a system.

In this article we’ll take a brief look at which of the 13 diagrams are of most relevance for us and how they fit together...

Author: Jan Kusiak



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