Domain Classes and Entities in Systems Analysis
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Domain Classes and Entities in Systems Analysis

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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</p> Signup and view all the answers

    How should you read associations and relationships?

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

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

    <p>Cardinality</p> Signup and view all the answers

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

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

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

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

    What is the purpose of identifying domain classes?

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

    What is the key for the Booking class?

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

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

    <p>Superclass</p> Signup and view all the answers

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

    <p>Inheritance</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</p> Signup and view all the answers

    What are the attributes of OnlineSale?

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

    What do subclasses inherit from the superclass?

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

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

    <p>Aggregation</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</p> Signup and view all the answers

    What symbol is used to represent composition in UML diagrams?

    <p>Filled-in diamond</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.</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</p> Signup and view all the answers

    How many types of relationships are there in class diagrams?

    <p>3</p> Signup and view all the answers

    What is an example of a composition relationship?

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

    How many domain classes are in the RMO CSMS overall?

    <p>27</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</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</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</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</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</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</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</p> Signup and view all the answers

    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.

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    Description

    Learn about domain classes and entities in systems analysis and design, including how to identify them using brainstorming techniques and noun identification.

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