Visualizing Concepts With a Domain Model

8/18/2019 Visualizing Concepts With a Domain Model

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Intell Agile

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

VisualizingVisualizingConceptsConcepts

with awith aDomainDomainModelModel


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Intell Agile OverviewOverview

A Domain Model visualizes noteworthyA Domain Model visualizes noteworthy

concepts or o!ects in the domain.concepts or o!ects in the domain.

"ou will e ale to# "ou will e ale to#

$ead and write the %ML class diagram$ead and write the %ML class diagram

notation &or a Domain Modelnotation &or a Domain Model

Create a Domain ModelCreate a Domain Model

Apply guidelinesApply guidelines $elate it to other arti&acts$elate it to other arti&acts

use cases sys. sequence diagrams domain models operation contract


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Intell Agile D'()*)+)O* , MO+)-A+)O*# Domain ModelD'()*)+)O* , MO+)-A+)O*# Domain Model

AA Domain ModelDomain Model visualizes using %ML classvisualizes using %ML class

diagram notation noteworthy concepts ordiagram notation noteworthy concepts or

o!ects.o!ects. )t is a /ind o& visual dictionary.1)t is a /ind o& visual dictionary.1

Not Not a picture o& so&tware classes.a picture o& so&tware classes.

)t helps us identi&y relate and visualize)t helps us identi&y relate and visualize

important in&ormation.important in&ormation.

)t provides inspiration &or later creation o&)t provides inspiration &or later creation o&

so&tware design classes to reduceso&tware design classes to reduce

representational gap.1representational gap.1



4/16

Intell Agile 'AM3L'# 3artial Domain Model'AM3L'# 3artial Domain Model

V i d e o

I D

S t o c k s

R e n t s

R e n t s - f r o m

11 . . *

1 *1

*

V i d e o S t o r e

a d d r e s s

n a m e

p h o n e N u m e r

! u s t o m e r

a d d r e s s

n a m e

p h o n e N u m e r



5/16

Intell Agile 4%)D'L)*'5# (inding Domain Concepts4%)D'L)*'5# (inding Domain Concepts

Candidate lists 6see te7t p. 89:;Candidate lists 6see te7t p. 89:;

Aott1 Analysis< A=A Linguistic AnalysisAott1 Analysis< A=A Linguistic Analysis

Most simply pic/ out the nouns1Most simply pic/ out the nouns1

'7isting analysis patterns#'7isting analysis patterns#


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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Intell Agile %ML# Associations%ML# Associations

VideoVideoStoreStocks

*1

association name multiplicity

-"direction reading arro#"

-it has no meaning e$cept to indicate direction of

reading the association lael

-optional



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Intell Agile %ML# Multiplicity%ML# Multiplicity

%ero or more&

"many"

one or more

one to forty

e$actly fi'e

(

(

(

(

*

1..*

1..)

+

(,- +- e$actly three-

fi'e or eight

!ustomer

Video

Rents

*

/ne instance of a

!ustomer may e

renting %ero or more

Videos.

/ne instance of a Video

may e eing rented y

%ero or one !ustomers.

..1



8/16

Intell Agile 4%)D'L)*'5# Associations4%)D'L)*'5# Associations

Only add associations &orOnly add associations &or noteworthy noteworthy relationships.relationships.

Literally those &or which ma/ing a note1 is worthyLiterally those &or which ma/ing a note1 is worthy

or usiness motivated.or usiness motivated.Video

...Rents

Influenced-y

1

1..*

1 0oan olicy

...

!ustomer

...

Important association.

Need to rememer.

0o# 'alue association.

ossile ut so #hat2



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Intell Agile %ML and 4%)D'L)*'5# Attriutes%ML and 4%)D'L)*'5# Attriutes

5how only simple1 relatively primitive types5how only simple1 relatively primitive types

as attriutes.as attriutes.

Connections to other concepts are to eConnections to other concepts are to e

represented as associations not attriutes.represented as associations not attriutes.

a y m e n t

d a t e 3 D a t e

t i m e 3 ( i m e

a m o u n t 3 4 o n e y

a t t r i u t e s



10/16

Intell Agile 4%)D'L)*'5# Attriutes4%)D'L)*'5# Attriutes

>hy??>hy??

Video

...Rents

1 1..*!ustomer

...5etter

Video

renter 3 !ustomer

!ustomer

rentedVideos3 0ist of Video6orse



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Intell Agile 'AM3L'# Domain Model'AM3L'# Domain Model

!atalog

VideoDescription

title

su7ect!ategory

VideoRental

dueDate

returnDate

return(ime

!ashayment

amount 3 4oney

Video

ID

Stocks

Rents

Rents-from

ays-for

Initiates

/#ns-a

Descried-y

4emership

ID

startDate

1

1

1..*

1

1

1

1..*

1

1

*

1

1

1

*1*

ays-for-o'erdue-charges

Rental(ransaction

date

0oanolicy

perDayRental!harge

perDay0ate!harge

Determines-rental-charge

1

Defines

1..*

*

1..*

1

1

* *

VideoStore

address

namephoneNumer

!ustomer

address

namephoneNumer

1

1

1..*

Records-rental-of

..1

1

8as 4aintains

*

1

1

Notice how this can

be viewed as a

“visual dictionary.”

It illustrates concepts, words,

things in a domain.



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Intell Agile

8.8. )n small teams at the whiteoard draw a)n small teams at the whiteoard draw a

partial Domain Model limited to the Mainpartial Domain Model limited to the Main

5uccess 5cenario o& the5uccess 5cenario o& the Process SaleProcess Sale useusecase and assuming iteration 8case and assuming iteration 8

[email protected]@cations.

%se the te7ts use case as the asis. p.%se the te7ts use case as the asis. p.B0B0

Apply the guidelinesApply the guidelines



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Intell Agile

Domain

Model

Requirements

BusinessModeling

Design

Partialartifacts,

refined in each

iteration.

Use-Case Model

text

use

cases

:System

system

operationcontracts

system

sequence

diagrams

use

case

diagrams

*

*

Design Model

system

operations

Arti&acts in the %3 %seCase ModelArti&acts in the %3 %seCase Model



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Intell Agile $ecommended $esources$ecommended $esources


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


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Intell Agile

8.8. >ithout notes draw all %3 disciplines and>ithout notes draw all %3 disciplines and

arti&acts discussed and relate them.arti&acts discussed and relate them.



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Intell Agile

8.8. O!ectives assessment. Can you#O!ectives assessment. Can you#

$ead and write the %ML class diagram$ead and write the %ML class diagram

notation &or a Domain Modelnotation &or a Domain Model

Create a Domain ModelCreate a Domain Model

Apply guidelinesApply guidelines

$elate it to other arti&acts$elate it to other arti&acts

use cases sys sequence diagrams domain models operation contract

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Visualizing Concepts With a Domain Model