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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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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