Lesson6 ISAD IBM UCModeling

8/18/2019 Lesson6 ISAD IBM UCModeling

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IBM Software Group

®

Essentials of Visual Modeling with UML 2.0

Module ! Use"#ase Modeling


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Objectives

$es%ri&e s'ste( &eha)ior and show how to%apture it in a (odel.

$e(onstrate how to read and interpret! * use"%ase diagra(

*n a%ti)it' diagra(


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Where Are We?

#on%epts in use"%ase(odeling

Use"%ase diagra(s

*%ti)it' diagra(s


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What Is System Behavior?

S'ste( &eha)ior is how a s'ste( a%ts andrea%ts. It %o(prises the a%tions and a%ti)ities of a

s'ste(.

S'ste( &eha)ior is %aptured in use %ases.Use %ases des%ri&e the intera%tions &etween

the s'ste( and ,parts of- its en)iron(ent.


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What Is a Use-Case Model?

* (odel that des%ri&es a s'ste(/sfun%tional reuire(ents in ter(s of use%ases.

* (odel of the s'ste(/s intended

fun%tions ,use %ases- and its en)iron(ent,a%tors-.View eport #ard

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What Are the Benefits of a Use-Case Model?

#o((uni%ation

Identifi%ation

Verifi%ation

End User $o(ain E3pert Users

Verifi%ation

I d e n t i f i %

a t i o n

Use #ase

#o((uni%ation


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Major Concepts in Use-Case Modelin

*n a%tor represents an'thingthat intera%ts with the s'ste(.

* use %ase des%ri&es aseuen%e of e)ents5perfor(ed &' the s'ste(5 that

'ields an o&ser)a&le result of)alue to a parti%ular a%tor.

*%tor

Use #ase


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Use"%ase diagra(s

*%ti)it' diagra(s

Where Are We?


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What Is an Actor?

*%tors represent roles a user of

the s'ste( %an pla'. 8he' %an represent a hu(an5 a

(a%hine5 or another s'ste(.

8he' %an a%ti)el' inter%hangeinfor(ation with the s'ste(.

8he' %an &e a gi)er ofinfor(ation.

8he' %an &e a passi)e re%ipientof infor(ation.

*%tors are not part of thes'ste(. *%tors are E98E:*L.

*%tor


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What Is a Use Case?

Use #ase

$efines a set of use"%ase instan%es5 whereea%h instan%e is a seuen%e of a%tions as'ste( perfor(s that 'ields an o&ser)a&leresult of )alue to a parti%ular a%tor.

* use %ase (odels a dialogue &etween one or(ore a%tors and the s'ste(

* use %ase des%ri&es the a%tions the s'ste(ta;es to deli)er so(ething of )alue to the a%tor


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Use Cases and Actors

* use %ase (odels a dialog &etween a%torsand the s'ste(.

* use %ase is initiated &' an a%tor to in)o;ea %ertain fun%tionalit' in the s'ste(.

*%tor

*sso%iationUse #ase


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!o" Wo#ld $o# %ead &his 'iaram?

View Report Card

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Use"%ase diagra(s

*%ti)it' diagra(s

Where Are We?


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What Is an Activity 'iaram?

*n a%ti)it' diagra( in the use"%ase (odel %an &e

used to %apture the a%ti)ities and a%tionsperfor(ed in a use %ase.

It is essentiall' a flow %hart5 showing flow of%ontrol fro( one a%ti)it' or a%tion to another.

Flow of Events

8his use %ase starts when the egistrar reuests that the

s'ste( %lose registration.

1. 8he s'ste( %he%;s to see if registration is in progress. If

it is5 then a (essage is displa'ed to the egistrar and the

use %ase ter(inates. 8he #lose egistration pro%essing

%annot &e perfor(ed if registration is in progress.

2. =or ea%h %ourse offering5 the s'ste( %he%;s if a

professor has signed up to tea%h the %ourse offering and at

least three students ha)e registered. If so5 the s'ste(

%o((its the %ourse offering for ea%h s%hedule that %ontains

it.

*%ti)it' 1 *%ti)it' +

*%ti)it' 2


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What Is an Activity?

* spe%ifi%ation of &eha)ior e3pressed as aflow of e3e%ution )ia seuen%ing ofsu&ordinate units.

Su&ordinate units in%lude nested a%ti)ities and

ulti(atel' indi)idual a%tions. Ma' %ontain &oolean e3pression %onstraints

when the a%ti)it' is in)o;ed or e3ited

>>


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()ample* Activity 'iaram

S'n%hroni@ation

Bar ,=or;-

Guard#ondition

S'n%hroni@ation

Bar ,Aoin-

$e%ision

#on%urrent8hreads

8ransition

Sele%t #ourse

add %ourse C

#he%;

S%hedule

#he%;


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%evie"

hat is s'ste( &eha)iorF

hat is a use"%ase (odelF hatare its &enefitsF

hat is an a%torF * use %aseF

hat is an a%ti)it' diagra(F


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()ercise

Gi)en!Use %ases5 a%tors and

asso%iations

$raw!

* use"%ase diagra(

Gi)en! *%tion states and a%ti)it' edges

$raw! *n a%ti)it' diagra(

Lesson6 ISAD IBM UCModeling

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