DOmain Model

1. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Module 2 - Static Use Case Modeling 1
Title of Topic:
Associations, Attributes
Course Code: 20CS501
Course Title: Object Oriented Analysis and Design
Session Number: 2.6
Faculty Name: Ms. P. Anantha Prabha
Academic Year: 2022 - 2023 (Odd Sem)

2. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Module 2 - Static Use Case Modeling 2
Module 2 - Static Use Case Modeling
2.1 Use Case Modeling: Modeling Requirements, Components
2.2 Use Case Identification and Description
2.3 Use Case Relationships
Use Case Modeling, Relating Use cases - Include-Extend-
Generalization
Class Diagram-Elaboration, Domain Model
2.5 Finding Conceptual Classes and Description Classes
2.6 Associations, Attributes, Domain Modeling Using Class Diagrams
2.7 Domain Model Refinement, Finding conceptual class Hierarchies-
Aggregation and Composition
CO3 Interpret Use Case relationships in Use Case Modeling
CO4 Identify the object and class relationships for building UML diagrams

3. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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Associations
An association is a relationship between instances of
types that indicates some meaningful and interesting
connection

4. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

5. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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Useful Associations
• Associations for which knowledge of the relationship
needs to be preserved for some duration.
• Associations derived from the Common Associations
List.

6. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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UML Association Notation
• An association is represented as a line between
classes with an association name.
• Associations are inherently bidirectional.
• Optional reading direction arrow is only an aid to the reader
of the diagram.

7. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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Finding Associations
Common Association List
The common categories that are worth considering
are:
• A is a physical part of B . Eg: Wing-Airplane
• A is a logical part of B. Eg: SalesLineItem- Sale.
• A is physically contained in B . Eg: Register- Store.

8. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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Common Associations List 2
• A is logically contained in B.
Eg:ItemDescription-Catalog.
• A is a description of B.Eg:ItemDescription- Item.
• A is a line item of a transaction or report
B.Eg:SalesLineItem-Sale.
• A is a member of B .Eg: Cashier-Store.
• A uses or manages B.Eg:Cashier-Register.

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Common Associations List 3
• A is known/logged/recorded/reported/captured in B.Eg:
Sale-Register.
• A is an organizational subunit of B .
Eg:Department-Store.
• A communicates with B. Eg:Customer- Cashier.
• A is next to B. Eg:City-City.

10. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
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Common Associations List 4
• A is related to a transaction B. Eg:
Customer-Payment.
• A is a transaction related to another
transaction B. Eg:Payment-Sale.
• A is next to B. Eg:City-City.
• A is owned by B. Eg:Register-Store.
• A is an event related to B. Eg:Sale-Customer.

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High-Priority Associations
• A is a physical or logical part of B.
• A is physically or logically contained in/on B.
• A is recorded in B.

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Associations Guidelines
• The knowledge of the relationship needs to be preserved
for some duration.
• Identifying conceptual classes is more important than
identifying associations.
• Avoid showing redundant or derivable associations.

13. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes
Multiplicity defines how many instances of a class A can be associated
with one instance of a class B

14. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

15. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes
Naming Associations
Name an association based on a TypeName-VerbPhrase-TypeName format
where the verb phrase creates a sequence that is readable and meaningful in
the model context.

16. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes
 An association indicates that the system you are developing stores links
of some kind between the instances of the associated types.
 An association is a diagrammatic method of showing an attribute or pair
of attributes.

17. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes
 An attribute is a logical data value of an object.
 For example, a receipt (which reports the information of a sale)
normally includes a date and time, and management wants to know the
dates and times of sales for a variety of reasons. Consequently, the Sale
conceptual class needs a date and time attribute.

18. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Modeling Attribute Quantities and Units

19. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

20. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

21. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Association and Multiplicity
Association and Multiplicity-

22. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

23. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Associations and Attributes

24. Session 6 – Associations, Attributes, Domain Modeling Using Class Diagrams
Try Yourself