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Chapter 7 - Review Questions

Chapter 7 - Review Questions - 2 Objects are depicted as...

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1 Marks: 5 What are the four basic parts of a use case model? What is its purpose or objective? The four parts of a use case model are the use case identifier (an oval), the use case actor (a stick figure), the relationship connecting lines, and the system boundary. The objective of the use case model is to identify all of the ways the users will use or interact with the system. 2 Marks: 5 What is the purpose of a system sequence diagram? What symbols are used in a system  sequence diagram? The system sequence diagram identifies the input and output messages to the automated system for a use case. The input and output messages describe the inputs and outputs to the system. The symbols used in a system sequence diagram are the following: 1.) Actors are depicted by stick figures
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Unformatted text preview: 2.) Objects are depicted as rectangles with the inside label underlined 3.) Lifelines are attached to actors and objects. Lifelines are depicted by vertical dashed lines beneath the actors and objects 4.) The input and output messages are depicted as arrows between the lifelines 3 Marks: 5 What are the steps required to develop a system sequence diagram? There are four steps. In most cases the SSD can be developed from an activity diagram or a flow of events on the use case description. 1.) Identify the input messages. 2.) Describe the messages from the external actor to the system 3.) Identify and add any special conditions for the message including iteration 4.) Identify and add the output return messages....
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