Domain Classes and Entities in Systems Analysis

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is an object in the context of a class?

  • A general template for creating multiple instances
  • A specific instance of the class with its own values for an attribute (correct)
  • A specific instance of the class with shared values for an attribute
  • A collection of classes with similar characteristics

What is the term for the number of associations between classes in UML?

  • Cardinality
  • Multiplicity (correct)
  • Relationship
  • Association

What is the difference between an association and a relationship?

  • A relationship is between entities, while an association is between classes
  • An association is in UML, while a relationship is in ERD (correct)
  • A relationship is in UML, while an association is in ERD
  • An association is mandatory, while a relationship is optional

What is the minimum constraint in an association?

<p>Zero (C)</p> Signup and view all the answers

How should you read associations and relationships?

<p>Separately in both directions (C)</p> Signup and view all the answers

What is the term for the number of relationships in ERD?

<p>Cardinality (A)</p> Signup and view all the answers

What is another term for 'domain classes' in database classes?

<p>Data entities (D)</p> Signup and view all the answers

What technique uses a checklist of typical types of things to identify domain classes?

<p>Brainstorming Technique (B)</p> Signup and view all the answers

What is the first step in identifying domain classes?

<p>Identify a user and a set of use cases (A)</p> Signup and view all the answers

What type of things are typically found in brainstorming for domain classes?

<p>Tangible things, locations, and roles (B)</p> Signup and view all the answers

What is the purpose of identifying domain classes?

<p>To capture information about the system (B)</p> Signup and view all the answers

What is the next step after identifying a user and a set of use cases?

<p>Brainstorm with the user to identify things involved (B)</p> Signup and view all the answers

What is the outcome of the brainstorming process for identifying domain classes?

<p>An initial list of domain classes (A)</p> Signup and view all the answers

What is the final step in the process of identifying domain classes?

<p>Merge the results, eliminate any duplicates, and compile an initial list (C)</p> Signup and view all the answers

What is the purpose of the association class in Systems Analysis and Design?

<p>To provide a name and meaning for the association (D)</p> Signup and view all the answers

What is the key for the Booking class?

<p>A unique identifier for each booking (B)</p> Signup and view all the answers

What is the term for a hierarchical relationship where subordinate classes are special types of the superior classes?

<p>Generalization/Specialization (C)</p> Signup and view all the answers

What is the superior or more general class in a generalization/specialization hierarchy?

<p>Superclass (D)</p> Signup and view all the answers

What is the concept that subclasses inherit characteristics of the more general superclass?

<p>Inheritance (A)</p> Signup and view all the answers

What is an abstract class?

<p>A class that allows subclasses to inherit characteristics but never gets instantiated (C)</p> Signup and view all the answers

What are the attributes of OnlineSale?

<p>timeOnSite, chatUse, saleDateTime, priorityCode, S&amp;H, tax, totalAmt… (A)</p> Signup and view all the answers

What do subclasses inherit from the superclass?

<p>Both attributes and associations (D)</p> Signup and view all the answers

What type of relationship exists between a car and its wheels?

<p>Aggregation (B)</p> Signup and view all the answers

What is the term for a whole-part relationship where the component part exists separately and can be removed and replaced?

<p>Aggregation (A)</p> Signup and view all the answers

What symbol is used to represent composition in UML diagrams?

<p>Filled-in diamond (A)</p> Signup and view all the answers

What is the main difference between aggregation and composition?

<p>Aggregation allows for removal and replacement of parts, while composition does not. (B)</p> Signup and view all the answers

What is the term for a relationship where one class is a component or part of another class?

<p>Whole Part Relationship (D)</p> Signup and view all the answers

How many types of relationships are there in class diagrams?

<p>3 (B)</p> Signup and view all the answers

What is an example of a composition relationship?

<p>An order and its order items (C)</p> Signup and view all the answers

What is the term for a relationship where a subclass inherits characteristics from a parent class?

<p>Inheritance (A)</p> Signup and view all the answers

How many domain classes are in the RMO CSMS overall?

<p>27 (D)</p> Signup and view all the answers

What is the purpose of creating an initial draft of the domain model class diagram?

<p>To guide development (D)</p> Signup and view all the answers

What is the benefit of creating one domain model class diagram per subsystem?

<p>To help those working on a subsystem (C)</p> Signup and view all the answers

What may happen when reviewing the use cases from Chapter 3?

<p>Classes and associations will be duplicated (C)</p> Signup and view all the answers

What is the purpose of creating an overall domain model class diagram?

<p>To provide an overview of the whole system (B)</p> Signup and view all the answers

In what stage of the project is the initial draft of the domain model class diagram usually completed?

<p>In early iterations (B)</p> Signup and view all the answers

What should be done when reviewing the use cases from Chapter 3?

<p>Decide what classes and associations are required for each subsystem (B)</p> Signup and view all the answers

What can be done with the complete RMO CSMS Domain Model Class Diagram?

<p>Try completing the Order Fulfilment Subsystem Domain Model Class Diagram (B)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

Domain Classes and Entities

  • In systems analysis and design, "things" are modeled as domain classes or data entities.
  • A domain class is a type of thing that has attributes and relationships with other domain classes.

Identifying Domain Classes

  • Use brainstorming techniques to identify domain classes, such as:
    • Checklist of typical types of things found in a system (e.g., tangible things, organizational units, sites/locations, incidents/events).
    • Noun technique (identify all nouns in the system description and determine if they are domain classes, attributes, or not relevant).
    • Identify users and stakeholders to gather information about things involved in the use case.

Domain Classes and Objects

  • A domain class is a general concept, whereas an object is a specific instance of the class, with its own attribute values.

Associations and Relationships

  • Associations are naturally occurring relationships between classes (e.g., UML term).
  • Multiplicity refers to the number of associations between classes (e.g., 1:1 or 1:many).
  • Associations can be read in both directions (e.g., "A customer places an order" and "An order is placed by a customer").
  • Associations have minimum and maximum constraints, which can be optional or mandatory.

Generalization/Specialization

  • Generalization/specialization is a hierarchical relationship where subordinate classes are special types of the superior class.
  • Inheritance is the concept that subclasses inherit characteristics of the more general superclass.

Abstract and Concrete Classes

  • Abstract classes allow subclasses to inherit characteristics but are never instantiated.
  • Concrete classes can have instances.

Whole-Part Relationships

  • Whole-part relationships are relationships between classes where one class is part of or a component of another class.
  • Aggregation is a whole-part relationship where the component part exists separately and can be removed and replaced.
  • Composition is a whole-part relationship where the parts cannot be removed.

Class Diagrams

  • There are three types of relationships in class diagrams: association relationships, whole-part relationships, and generalization/specialization relationships.
  • Domain model class diagrams show the classes and relationships in a system.

Creating a Domain Model Class Diagram

  • There are several ways to create a domain model class diagram, including creating one overall diagram or one per subsystem.
  • The domain model class diagram is used to guide development and is updated throughout the development process.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser