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2、tSystems―AnOverview★OriginofDSSOperationsResearch(OR)helpspeopletosettlethespecificstyleofproblembymeansofasinglemodel,whereasManagementInformationSystem(MIS)helpspeopletoeffectivelymanagethewholedatabymeansofdatabase・Whentherealproblembecomesocomple

3、xthatasinglemodelcannotprocessit,moremodelsshouldbecombinedtoprocessit.Therecameaproblem,thatis,howtopassthenecessarydatainthecaseofmulti-modelcombinationispresent,whichisimplementedtraditionallyinvariables・Therefore,howtoorganizethelargeamountofmode

4、ls,andhowtopassthecalculationdatabetweenthedifferentmodels,thisisjusttheoriginofDSS・★StructuredandUnstructuredproblemWhentheproblemcanbeformulizedorprocedured,orthesolutionisoneandonlywiththedifferentpeople,wecansaytheproblemisstructuredproblem・Where

5、aswhenthesolutionisnotoneandonlywithdifferentpeople,wesayitunstnicturedproblem.Forexample,evalutionsonapaintingisaunstructuredprolbembecausedifferentpeoplehavedifferentpreference・Structureproblem,unstructuredproblem,semi-structuredproblem.★Definition

6、ofDSSTherearefourdefinitionsaboutDSS,theyareDSSisaninteractivecomputersystemthathelpsdecision-makertosolvesemi-stnicturedproblembymeansofdataandmodels・(R.H.SpraqueandE.D.Carlson)DSSisaaggregationofdecision,supportandsystem,thatis,throughtheuseofthede

7、velopingcomputersystem,ofthegraduallyextendedsupportingability,decisionsupportingiswellachieved.(P.GW.Keen)DSSistheprocedurethatfindingthenecessarydataindatabase,utilizingmodel,andthenproducingthenecessaryinformation.(S.S.Mittra)DSSisahuman・machinein

8、teractivecomputersystem,whichsyntheticallyutilizeslargeamountofdata,neatlycombineslargenumbersofmodels,andeventuallysupportsdifferentlevelsofdecision-makerstoachieveascientificdecision.(CHENWenwei)databaseModelbase★RelationsofORandDSSDSSdevelopsitsel