![]() Designing and documenting the behavior of a system or a specific feature.Understanding and visualizing the flow of interactions between objects or components.Sequence diagrams are helpful for various purposes, including: Optional Fragments: Sequence diagrams can also include optional fragments, such as loops, conditionals, and alternative paths, which help illustrate different scenarios and decision points within the interaction.They are usually represented by a dashed line and are labeled to show the result or value being returned. Return Messages: These indicate the response from an object to a message it received.They are depicted as a box or vertical rectangle on the lifeline and show the duration of the object’s involvement in the interaction. Activation Bars: These represent the period during which an object is active and processing a message.Messages can be synchronous (blocking) or asynchronous (non-blocking), and they typically have labels that describe the action or method being invoked. ![]() Messages: These are the horizontal arrows or lines that connect lifelines, indicating the order of messages passed between objects.Each lifeline is typically depicted as a vertical line, and their names are often placed at the top of these lines. Lifelines: These represent the individual objects or components involved in the interaction.Key elements and concepts in a sequence diagram include: They are commonly used during the design and documentation phases of software development. Sequence diagrams are particularly useful for depicting the dynamic behavior of a system and how different components collaborate to achieve a specific task or goal. A sequence diagram is defined as a type of UML (Unified Modeling Language) diagram used in software engineering and systems design to visualize the interactions and communication between various components or objects within a system.
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