It is represented by a dashed line with an arrow pointing back to the original sender. Reply message: This is a message that is sent in response to a synchronous message.Messages types: In addition to synchronous and asynchronous messages, there are two types of messages that can be included in a sequence diagram:.It is a rectangle that is drawn on the lifeline, with the top and bottom edges aligned with the message it is processing. Activation box: This represents the time during which an object or actor is actively processing a message. ![]() It is a vertical line that extends downwards from the object or actor shape. Lifeline: This represents the lifespan of an object or actor in the sequence diagram. ![]() Actors: These are the external entities that interact with the system, such as customers, suppliers, and other stakeholders.Objects are represented by rectangular shapes, with the name of the object written inside the shape. Objects: These are the entities that interact with each other in the system, such as systems and applications.The following elements are typically included in a sequence diagram: The messages can be synchronous, where the sender waits for a response from the receiver before proceeding, or asynchronous, where the sender does not wait for a response and continues with other tasks. ![]() In a sequence diagram, the interactions are represented as a sequence of messages exchanged between the different objects or components. In the context of business analysis, sequence diagrams are a powerful tool to document the business processes and the interactions between different stakeholders, systems, and applications. Sequence diagrams are a type of interaction diagram used in software engineering to visualize the interactions between objects or components within a system.
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