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Questions and Answers
What is an object in the context of a class?
What is the term for the number of associations between classes in UML?
What is the difference between an association and a relationship?
What is the minimum constraint in an association?
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How should you read associations and relationships?
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What is the term for the number of relationships in ERD?
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What is another term for 'domain classes' in database classes?
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What technique uses a checklist of typical types of things to identify domain classes?
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What is the first step in identifying domain classes?
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What type of things are typically found in brainstorming for domain classes?
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What is the purpose of identifying domain classes?
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What is the next step after identifying a user and a set of use cases?
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What is the outcome of the brainstorming process for identifying domain classes?
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What is the final step in the process of identifying domain classes?
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What is the purpose of the association class in Systems Analysis and Design?
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What is the key for the Booking class?
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What is the term for a hierarchical relationship where subordinate classes are special types of the superior classes?
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What is the superior or more general class in a generalization/specialization hierarchy?
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What is the concept that subclasses inherit characteristics of the more general superclass?
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What is an abstract class?
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What are the attributes of OnlineSale?
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What do subclasses inherit from the superclass?
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What type of relationship exists between a car and its wheels?
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What is the term for a whole-part relationship where the component part exists separately and can be removed and replaced?
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What symbol is used to represent composition in UML diagrams?
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What is the main difference between aggregation and composition?
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What is the term for a relationship where one class is a component or part of another class?
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How many types of relationships are there in class diagrams?
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What is an example of a composition relationship?
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What is the term for a relationship where a subclass inherits characteristics from a parent class?
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How many domain classes are in the RMO CSMS overall?
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What is the purpose of creating an initial draft of the domain model class diagram?
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What is the benefit of creating one domain model class diagram per subsystem?
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What may happen when reviewing the use cases from Chapter 3?
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What is the purpose of creating an overall domain model class diagram?
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In what stage of the project is the initial draft of the domain model class diagram usually completed?
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What should be done when reviewing the use cases from Chapter 3?
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What can be done with the complete RMO CSMS Domain Model Class Diagram?
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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.