Model-Driven Evolution of Software Architectures - Software and ...
Model-Driven Evolution of Software Architectures - Software and ...
Model-Driven Evolution of Software Architectures - Software and ...
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64 Chapter4. Evaluation<br />
Describe<br />
Develop<br />
Architecture Scenarios<br />
Classify / prioritise<br />
scenarios<br />
Individually evaluate<br />
indirect scenarios<br />
Assess scenario<br />
interaction<br />
Create overall<br />
evaluation<br />
Figure 4.3:SAAMsteps[Clementsetal.,2002b].<br />
selectedmethodisavailable. Theseconstraintsimplytheexclusion<strong>of</strong><br />
many<strong>of</strong>theinventoriedmethodsbecausetheseeitherfocusonadifferent<br />
qualityattributeorlacksufficientdetail,e.g. manymethodsaredefined<br />
<strong>and</strong>explainedinonlyonepublishedarticle.<br />
Thebest-suitedmethodsdescribedintheinventoryseemtobeSAAM<strong>and</strong><br />
itssuccessor,theArchitectureTrade<strong>of</strong>fAnalysisMethod[Clementsetal.,<br />
2002b](ATAM). Bothaddressmaintainability<strong>and</strong>areextensivelydocumented.<br />
AlthoughATAMislikelytoproducemoreobjective<strong>and</strong>accurate<br />
results,italsoseemsmoredifficulttoapplyforinexperiencedassessors.<br />
Theuse<strong>of</strong>attribute-basedarchitecturestyles<strong>and</strong>theirassociatedqualityattributecharacterisationsforanalysis<strong>of</strong>architecturaldecisionsisnot<br />
straightforward. Alsotheidentification<strong>of</strong>sensitivity<strong>and</strong>trade-<strong>of</strong>fpoints<br />
<strong>and</strong>thegeneration<strong>of</strong>autilitytreerequiresmoreeffort<strong>and</strong>experience.<br />
DuetoOcé’srequirementswithrespecttotheneedfortraining(noneed)<br />
<strong>and</strong>organisationalimpact(low)<strong>of</strong>themethod,SAAMwasselected.<br />
InaSAAMevaluation, scenariosaredevelopedtoassessas<strong>of</strong>tware<br />
architecture’ssupportformaintainability. Thescenariosareusedtoexpresstherequiredtype<strong>of</strong>maintainability<strong>and</strong>thusSAAMcanalsobeusedtoevaluatethetype<strong>of</strong>maintainabilitywedescribedpreviously.Thedevelopedscenariosrepresentpossiblefuturechangestothes<strong>of</strong>twaresystem.Animportantaspect<strong>of</strong>SAAMisthatitinvolvesallstakeholders<strong>of</strong>as<strong>of</strong>twarearchitectureinajointevaluationsession,whichresultsinabetter<br />
appreciation <strong>and</strong> a more widely shared underst<strong>and</strong>ing <strong>of</strong> the s<strong>of</strong>tware<br />
architecture.
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