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www.craiglarman.comCopyright 2002 Craig Larman. All rights reserved.

VisualizingConcepts with

aDomainModel

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Overview

A Domain Model visualizes noteworthy concepts or

objects in the domain.

You will be able to:

Read and write the UML class diagram notation

for a Domain Model

Create a Domain Model

Apply guidelines Relate it to other artifacts

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DEFINITION & MOTIVATION: Domain Model

A Domain Modelvisualizes, using UML class

diagram notation, noteworthy concepts or objects.

It is a kind of visual dictionary.

Nota picture of software classes.

It helps us identify, relate and visualize important

information.

It provides inspiration for later creation of softwaredesign classes, to reduce representational gap.

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EXAMPLE: Partial Domain Model

Video

ID

Stocks4

Rents4

Rents-from4

11..*

1 *1

*

VideoStore

address

name

phoneNumber

Customer

address

name

phoneNumber

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GUIDELINES: Finding Domain Concepts

Candidate lists (see text, p. 134)

Abbott Analysis; AKA Linguistic Analysis

Most simply, pick out the nouns

Existing analysis patterns:

use cases sys. sequence diagrams domain models operation contract

http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0201895420/reader/2/002-3439525-6842407http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0932633293/reader/2/002-3439525-6842407

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UML: Associations

VideoVideoStoreStocks4

*1

association name multiplicity

-"direction reading arrow"

-it has no meaning except to indicate direction of

reading the association label

-optional

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UML: Multiplicity

zero or more;

"many"

one or more

one to forty

exactly five

T

T

T

T

*

1..*

1..40

5

T3, 5, 8 exactly three,

five or eight

Customer

Video

Rents

*

One instance of a

Customer may be

renting zero or more

Videos.

One instance of a Video

may be being rented by

zero or one Customers.

0..1

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GUIDELINES: Associations

Only add associations for noteworthyrelationships. Literally,

those for which making a note is worthy or business

motivated.Video

...Rents4

Influenced-by4

1

1..*

1 Loan Policy

...

Customer

...

Important association.

Need to remember.

Low value association.

Possible, but so what?

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UML and GUIDELINES: Attributes

Show only simple relatively primitive types as

attributes.

Connections to other concepts are to be

represented as associations, not attributes.

Payment

date : Date

time : Time

amount : Money

attributes

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GUIDELINES: Attributes

Why??

Video

...Rents

41 1..*Customer

...Better

Video

renter : Customer

Customer

rentedVideos: List of VideoWorse

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EXAMPLE: Domain Model

Catalog

VideoDescription

titlesubjectCategory

VideoRental

dueDatereturnDate

returnTime

CashPayment

amount : Money

Video

ID

Stocks4

Rents4

Rents-from4

Pays-for 4

Initiates4

Owns-a4

Described-by

Membership

ID

startDate

1

1

1..*

1

1

1

1..*

1

1

*

1

1

1

*

1*

Pays-for-overdue-charges 4

RentalTransaction

date

LoanPolicy

perDayRentalChargeperDayLateCharge

Determines-rental-charge4

1

Defines

1..*

*

1..*

1

1

* *

VideoStore

address

namephoneNumber

Customer

address

namephoneNumber

1

1

1..*

Records-rental-of

0..1

1

Has Maintains

*

1

1

Notice how this can

be viewed as a

visual dictionary.

It illustratesconcepts, words,

things in a domain.

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1. In small teams at the whiteboard, draw a partial

Domain Model, limited to the Main Success

Scenario of the Process Saleuse case, andassuming iteration 1 simplifications.

Use the texts use case as the basis. p. 50

Apply the guidelines

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Recommended Resources

use cases sys. sequence diagrams domain models operation contract

http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0139055975/reader/2/002-3439525-6842407http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0201895420/reader/2/002-3439525-6842407http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0932633293/reader/2/002-3439525-6842407http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0471353485/reader/2/002-3439525-6842407http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/0471380237/reader/2/002-3439525-6842407

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1. Without notes, draw all UP disciplines and

artifacts discussed, and relate them.

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1. Objectives assessment. Can you:

Read and write the UML class diagram

notation for a Domain Model

Create a Domain Model

Apply guidelines

Relate it to other artifacts

use cases sys sequence diagrams domain models operation contract