软件过程与管理.ppt

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1、SoftwareRequirementsObjectivesTointroducetheconceptsofuserandsystemrequirementsTodescribefunctionalandnon-functionalrequirementsToexplainhowsoftwarerequirementsmaybeorganisedinarequirementsdocumentTopicscoveredFunctionalandnon-functionalrequirementsUserrequirem

2、entsSystemrequirementsInterfacespecificationThesoftwarerequirementsdocumentRequirementsengineeringTheprocessofestablishingtheservicesthatthecustomerrequiresfromasystemandtheconstraintsunderwhichitoperatesandisdeveloped.Therequirementsthemselvesarethedescription

3、softhesystemservicesandconstraintsthataregeneratedduringtherequirementsengineeringprocess.Whatisarequirement?Itmayrangefromahigh-levelabstractstatementofaserviceorofasystemconstrainttoadetailedmathematicalfunctionalspecification.Thisisinevitableasrequirementsma

4、yserveadualfunctionMaybethebasisforabidforacontract-thereforemustbeopentointerpretation;Maybethebasisforthecontractitself-thereforemustbedefinedindetail;Boththesestatementsmaybecalledrequirements.Requirementsabstraction(Davis)TypesofrequirementUserrequirementsS

5、tatementsinnaturallanguageplusdiagramsoftheservicesthesystemprovidesanditsoperationalconstraints.Writtenforcustomers.SystemrequirementsAstructureddocumentsettingoutdetaileddescriptionsofthesystem’sfunctions,servicesandoperationalconstraints.Defineswhatshouldbei

6、mplementedsomaybepartofacontractbetweenclientandcontractor.DefinitionsandspecificationsRequirementsreadersFunctionalandnon-functionalrequirementsFunctionalrequirementsStatementsofservicesthesystemshouldprovide,howthesystemshouldreacttoparticularinputsandhowthes

7、ystemshouldbehaveinparticularsituations.Non-functionalrequirementsconstraintsontheservicesorfunctionsofferedbythesystemsuchastimingconstraints,constraintsonthedevelopmentprocess,standards,etc.DomainrequirementsRequirementsthatcomefromtheapplicationdomainofthesy

8、stemandthatreflectcharacteristicsofthatdomain.FunctionalrequirementsDescribefunctionalityorsystemservices.Dependonthetypeofsoftware,expectedusersandthetypeofsystemwheretheso