Virtual Labs

Design the time sequence model from use case depicting the interaction of the objects.

1. On January 20 2020, Merlin has asked the following question on the popular StackOverflow: “I want to know in detail about the difference between alt and opt fragment in sequence diagram, they seem similar, I can’t distinguish them. Anyone knows about this thing?” Which of the following answers are correct?

a: alt is more used for several choices, like a switch, while with opt code will be executed or not! Explanation

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b: alt is used to described alternative scenarios. Only one of the options will be executed. opt is used to describe an optional step. Explanation

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c: an opt fragment cannot be enclosed in other combined fragments such as strict or par, while alt can be enclosed in such fragments. Explanation

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d: an alt fragment cannot be enclosed in other combined fragments such as strict or par, while opt can be enclosed in such fragments. Explanation

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e: Both a and b. Explanation

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2. Suppose you are working on a software project for a hotel reservation system. You need to create a time sequence diagram to show how the system handles a new reservation request. Which of the following steps should you follow to draw the diagram?

a: Identify the objects involved in the scenario, and create a lifeline for each object. Explanation

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b: Identify the attributes and methods of each object, and define them in the diagram. Explanation

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c: Identify the events that occur in the scenario, and show the sequence of events on the diagram. Explanation

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d: Identify the classes that the objects belong to, and show the relationships between the classes on the diagram. Explanation

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3. Which of the following best describes the time sequence diagram generation process for the 'Release a Vehicle' use case?

a: It involves identifying the actors and their roles in the use case. Explanation

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b: It involves creating a graphical representation of the interactions between the actors and the system, in a chronological order. Explanation

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c: It involves creating a list of all possible scenarios that can occur within the use case. Explanation

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d: It involves documenting the requirements of the use case. Explanation

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4. In a sequence diagram, how are messages typically depicted?

a: As boxes. Explanation

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b: As arrows. Explanation

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c: As lines. Explanation

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d: As circles. Explanation

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5. What does an arrow between lifelines in a sequence diagram typically represent?

a: A state change. Explanation

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b: A message is being sent. Explanation

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c: A class relationship. Explanation

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d: An object being created. Explanation

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