Use Case Diagrams

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Questions and Answers

What is the purpose of a communication line in a use case diagram?

To show the relationship between an actor and a use case (correct)

To indicate the trigger of a use case

To separate actors from use cases

To represent the main flow of a use case

What is used to separate actors from use cases in a use case diagram?

Generalization arrow

Use case description

Communication line

System boundary (correct)

What is included in a use case description?

Related requirements, goal, and preconditions (correct)

Only successful and failed end conditions

Only primary actors and main flow

Only trigger and extension

What type of relationship is represented by a dotted arrow labeled with?

Uses Signup and view all the answers

What is an example of a special case in use case relationships?

One use case is a special type of another use case Signup and view all the answers

What is the purpose of the 'extends' relationship in use case diagrams?

To represent a reusable behavior that is optional Signup and view all the answers

What is the notation for the 'uses' relationship in use case diagrams?

Dotted arrow labeled with Signup and view all the answers

What is the term for when one use case is a type of another use case?

Use case generalization Signup and view all the answers

What does an actor in a use case represent?

A thing that interacts with your system Signup and view all the answers

What is an example of a non-human actor in a use case?

A system clock Signup and view all the answers

What is the notation used to represent an actor in a use case?

A labeled box or a stick man Signup and view all the answers

What is a use case?

An interaction or case where the system is being used to complete a specific job Signup and view all the answers

What is an example of an actor refinement?

A generalization of a user actor Signup and view all the answers

What is the purpose of identifying actors in a use case?

To understand who or what interacts with the system Signup and view all the answers

What is the main purpose of a use case in Unified Modeling Language?

To fulfill one or more of the user's requirements Signup and view all the answers

What is the significance of use cases in a system's design?

They affect and guide all other elements within the system's design Signup and view all the answers

What is the focus of Requirement A.1 in the Weblog CMS example?

Creating a new blog account Signup and view all the answers

What is the common aspect between Requirement A.1 and Requirement A.2?

Both use the Author Credentials Database for verification Signup and view all the answers

What is the primary role of an administrator in the Weblog CMS example?

To create a new blog account and personal Wiki Signup and view all the answers

What is the ultimate goal of using use cases in Unified Modeling Language?

To fulfill the user's functional requirements Signup and view all the answers

Study Notes

Use Cases in UML

Use Case Components

A use case is a case or situation where a system is used to fulfill one or more of a user's requirements.
A use case captures a piece of functionality that the system provides.
Actors are things that interact with the system, represented by a stick man or a labeled box, and should be given appropriate names.
Actors can be actual people or third-party systems, and can also be non-human entities like a system clock.
Actors can be refined using generalization, where one actor is a general actor of another, meaning the second actor can do everything the first actor can do.

Use Cases

A use case represents an interaction or case where the system is being used to complete a specific job.
Use cases are represented by an oval with a name that describes the interaction.
A good use case should have a clear and concise description.

Communication Lines and System Boundaries

A communication line connects an actor and a use case to show the actor participating in the use case.
System boundaries are used to separate actors (external) and use cases (internal), represented by a box, and should be named.

Use Case Descriptions

Use case descriptions should include:
- Related requirements
- Goal in context
- Preconditions
- Successful end condition
- Failed end condition
- Primary actors
- Secondary actors
- Trigger
- Main flow
- Extension

Use Case Relationships

Inclusion Relationships

An inclusion relationship represents a use case that can be reused by other use cases.
Inclusion relationships are represented by a dotted arrow labeled with <>.

Generalization Relationships

A generalization relationship represents a use case that is a special type of another use case (use case inheritance).
Generalization relationships are represented by a generalization arrow.

Extension Relationships

An extension relationship represents a reusable behavior that is optional.
Extension relationships are represented by a dotted arrow labeled with <>.

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Description

This quiz covers the components of use case diagrams, including communication lines and system boundaries.