Use Case Based Estimation 001 [Compatibility Mode]

8/9/2019 Use Case Based Estimation 001 [Compatibility Mode]

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Use Case Based EstimationUse Case Based Estimation

ranco s oe zeeranco s oe zee


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Project estimationProject estimation

Use case based techniqueUse case based technique

Number of use cases to be builtNumber of use cases to be built

Interaction difficulty of actorsInteraction difficulty of actors

Technical complexity factorsTechnical complexity factors

Environment complexity factorsEnvironment complexity factors


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Important note:Important note:

known projects to use as a baseline.known projects to use as a baseline.

Please, DO NOT use the provided guesstimates as a realPlease, DO NOT use the provided guesstimates as a realworld measure until you have some real world base lines toworld measure until you have some real world base lines tomeasure against.measure against.

If ou want to use itIf ou want to use it use it as a uideline to move towardsuse it as a uideline to move towards

a first cut baselinea first cut baseline


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The approach consists of:The approach consists of:

Weighting use casesWeighting use cases

CalCalculating UUCP (unadjusted use case points)culating UUCP (unadjusted use case points)

Setting up the complexity factorsSetting up the complexity factors

Calculating UCP (use case points)Calculating UCP (use case points)

Setting up default hours per UCPSetting up default hours per UCP Calculating estimated work effortCalculating estimated work effort


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Weighting actorsWeighting actors

the estimation effort or not.the estimation effort or not.

Actor t eActor t e Descri tionDescri tion FactorFactor

EasyEasy Interface or use of the system isInterface or use of the system is 11s m p es mp e e.g. program n er ace one.g. program n er ace ondata leveldata level

MediumMedium Interface or use of the system isInterface or use of the system is 22comp ca ecomp ca e e.g. n erac ve ore.g. n erac ve orprotocol driven interfaceprotocol driven interface

complexcomplex e.g. graphical interfacee.g. graphical interface


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Weighting use casesWeighting use cases

Use caseUse case

typetype

DescriptionDescription FactorFactor

EasyEasy Less than 3 transactions or less thanLess than 3 transactions or less than5 analysis classes used in the5 analysis classes used in theimplementation of the use caseimplementation of the use case

55

MediumMedium 44--7 transactions or 5 to 10 analysis7 transactions or 5 to 10 analysisclasses used in the im lementation ofclasses used in the im lementation of

1010

the use casethe use case

DifficultDifficult More than 7 transaction or more thanMore than 7 transaction or more than 1515implementation of the use caseimplementation of the use case


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system according to the classificationssystem according to the classifications

ActorActor DescriptionDescription FactorFactor NumberNumber ActorActortypetype of actorsof actors

ininsystemsystem

weightweight

simplesimple e.g. program interface one.g. program interface ondata leveldata level

MediumMedium Interface or use of the system isInterface or use of the system is 22 33 66

. .. .protocol driven interfaceprotocol driven interface

DifficultDifficult Interface or use of system isInterface or use of system is 33 22 66. .. .

Total Actor WeightTotal Actor Weight 1717


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Use caseUse case

typetype

DescriptionDescription FactorFactor NumberNumber

of useof usecases incases in

Use caseUse case

weightweight

systemsystem

EasyEasy Less than 3 transactions or less than 5Less than 3 transactions or less than 5analysis classes used in theanalysis classes used in the

55 55 2525

mp emen a on o e use casemp emen a on o e use case

MediumMedium 44--7 transactions or 5 to 10 analysis7 transactions or 5 to 10 analysisclasses used in the im lementation ofclasses used in the im lementation of

1010 33 3030

the use casethe use case

DifficultDifficult More than 7 transaction or more thanMore than 7 transaction or more than

10 analysis classes used in the10 analysis classes used in the

1515 1010 150150

implementation of the use caseimplementation of the use case

Total use case weightTotal use case weight 205205


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UUCP = Total actor weight + Total use case weightUUCP = Total actor weight + Total use case weight

UUCP for system X = 17 + 205UUCP for system X = 17 + 205==

e a one n ca es on y e comp ex y o ee a one n ca es on y e comp ex y o euse cases and the interfaces. It does not define theuse cases and the interfaces. It does not define the

within which it is to be implemented.within which it is to be implemented.

To do this additional dimensions of technicalTo do this additional dimensions of technicalcomplexity factors and environmental complexitycomplexity factors and environmental complexityfactors need to be defined.factors need to be defined.


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Setting up the complexity factorsSetting up the complexity factors -- technicaltechnical

FactorFactor DescriptionDescription WeightWeight ValueValue Ex ValueEx Value

FactorFactor Code signifying the factor that impacts on the projectCode signifying the factor that impacts on the project

DescriptionDescription A description of the technical complexity factorA description of the technical complexity factor

WeightWeight An average weight allocated to the factor. These factor weightings needs to beAn average weight allocated to the factor. These factor weightings needs to bereviewed after every project in order to assess their accuracyreviewed after every project in order to assess their accuracy

ValueValue The value is rated for the project specifically. The values are calculated from 0The value is rated for the project specifically. The values are calculated from 0--5; with 0 meaning the factor is irrelevant, and 5 meaning it is essential5; with 0 meaning the factor is irrelevant, and 5 meaning it is essential

Ex ValueEx Value This value is a calculated value that is arrived at by the following formula:This value is a calculated value that is arrived at by the following formula:Ex Value = Weight * ValueEx Value = Weight * Value

ReasonReason This is a descriptive field that may be used to explain why the specific value wasThis is a descriptive field that may be used to explain why the specific value wasallocated in this projectallocated in this project See EASee EA


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Setting up the complexity factorsSetting up the complexity factors -- environmentalenvironmental

FactorFactor DescriptionDescription WeightWeight ValueValue Ex ValueEx Value

FactorFactor Code signifying the factor that impacts on the projectCode signifying the factor that impacts on the project

DescriptionDescription A description of the technical complexity factorA description of the technical complexity factor

WeightWeight An average weight allocated to the factor. These factor weightings needs to beAn average weight allocated to the factor. These factor weightings needs to bereviewed after every project in order to assess their accuracyreviewed after every project in order to assess their accuracy

ValueValue The value is rated for the project specifically. The values are calculated from 0The value is rated for the project specifically. The values are calculated from 0--5; with 0 meaning the factor is irrelevant, and 5 meaning it is essential5; with 0 meaning the factor is irrelevant, and 5 meaning it is essential

Ex ValueEx Value This value is a calculated value that is arrived at by the following formula:This value is a calculated value that is arrived at by the following formula:Ex Value = Weight * ValueEx Value = Weight * Value

ReasonReason This is a descriptive field that may be used to explain why the specific value wasThis is a descriptive field that may be used to explain why the specific value wasallocated in this projectallocated in this project See EASee EA


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Calculating UCPCalculating UCP

Unadjusted TCF value (UTV) = 47Unadjusted TCF value (UTV) = 47

TCF weight factor (TWF) = 0.01 (Constant)TCF weight factor (TWF) = 0.01 (Constant) TCF Constant (TC) = 0.6TCF Constant (TC) = 0.6

**

= 0.6 + (0.01 * 47)= 0.6 + (0.01 * 47)

= 1.07= 1.07


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Unadjusted ECF value (UEV) = 21.5Unadjusted ECF value (UEV) = 21.5

ECF weight factor (EWF) =ECF weight factor (EWF) = --0.03 (Constant)0.03 (Constant) ECF Constant (EC) = 1.4ECF Constant (EC) = 1.4

**

= 1.4 + (= 1.4 + (--0.03 * 21.5)0.03 * 21.5)

= 0.755= 0.755


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UUCP = 222UUCP = 222

TCF = 1.07TCF = 1.07 ECF = 0.755ECF = 0.755

* ** *

= 222 * 1.07 * 0.755= 222 * 1.07 * 0.755

= 179.3437= 179.3437

179179


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Default hoursDefault hours This is the number of hours it willThis is the number of hours it will

DH = 10DH = 10

UCP = 179UCP = 179 Work day = 6 hoursWork day = 6 hours

= *= *

= 179 * 10= 179 * 10

= 1790 hours= 1790 hours

Estimated work effort (days) = 1790/6Estimated work effort (days) = 1790/6

= 298.333 days= 298.333 days

aysays


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uestions?uestions?


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Thank You!Thank You!

Documents

Use Case Based Estimation 001 [Compatibility Mode]