In a sequence diagram, participants are never end users. True or false?

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BlackTom AI · Accepted Answer

Question restatement: In a sequence diagram, participants are never end users. True or false?

Option: True.
- This statement would claim that end users cannot be depicted as participants in a sequence diagram. In practice, a sequence diagram often includes a user or actor as an external initiator or observer interacting with a system via messages. Treating end users as participants can help map requirements to concrete interactions, so saying they are never participants is misleading.

Option: False.
- The more accurate understanding is that end users can indeed be participants (often modeled as actors) in a sequence diagram. They are external entities that interact with the system under study, sending requests and receiving responses. This aligns with the UML concept of an actor representing a role outside the system boundary that communicates with the system via messages.

Why the statement in Option True is not correct: the blanket claim ignores common modeling practice where actors are depicted to illustrate who initiates or participates in the sequence of interactions. It would incorrectly exclude a common and useful modeling element, reducing the diagram’s expressiveness about user-system interactions.

Why the statement in Option False is more accurate: it acknowledges that end users can be represented as participants, typically as actors, and this representation helps convey real-world usage scenarios, responsibilities, and flow of messages between the user and the system. It captures the intended scope of sequence diagrams, which is to model interactions among involved entities, not to arbitrarily exclude end users.

Summary of the implications: recognizing end users as possible participants improves communicative value and aligns with standard modeling practices, whereas insisting they can never be participants would obscure essential interaction details and requirements.

SOFTWARE ENGINEERING I (CS_361_400_U2025) S2.4 - Sprint 2 Learning Quiz

In a sequence diagram, participants are never end users. True or false?

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SOFTWARE ENGINEERING I (CS_361_400_U2025) S2.4 - Sprint 2 Learning Quiz

In a sequence diagram, participants are never end users. True or false?

查看解析

登录即可查看完整答案

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更多留学生实用工具

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Select the right description for each of the following message types: 1: A Synchronous message 2: An Asynchronous message 3: A Return message