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Corporatestrategyisthereforeconcernedwiththedirectionofthefirmandthemanagementofitsproductlinesandbusinessunites.Corporatestrategydealswiththreeissuesfacingthecorporationasawhole:1.Directionalstrategy:Thefirm’soverallorientationtowardgrowth,stability,orretrenchment.Acorporation’sdirectionalstrategyiscomposedofthreegeneralorientationstowardgrowth(sometimescalledgrandstrategies)Growthstrategiesexpandthecompany’sactivities.Stabilitystrategiesmakenochangetothecompany’scurrentactivities.Retrenchmentstrategiesreducethecompany’slevelofactivities.GrowthstrategiesStabilitystrategiesRetrenchmentstrategies2.Portfoliostrategy:Theindustriesormarketsinwhichthefirmcompetesthroughitsproductsandbusinessunits;Managementviewstheproductlinesorbusinessunitsasinvestmentsthatshouldprovideareturnoninvestmentsuchasresourcecommitmentonbestproductstoensurecontinuedsuccessorresourcecommitmentonnewcostlyproductswhichmaybehighrisk.AdvantagesLimitations1)Promptedtopmanagersindividuallyassesseachbusinessofthecompany,andforthetarget,theallocationofresources.2)Forcecompaniestouseexternaldatatocomplementthemanagement'sjudgment.3)Putforwardtheavailableintheexpansionandgrowthofthecashflowproblem4)Usegraphicstorepresent,isconducivetocommunication1)Noteasytodefineproductandmarketsegments2)Putforwardtheproposalwithastandardstrategy3)Basedonthesubjectivejudgment4)Attractiveindustryisnotclear,inthelifecycleofproductsisnotclear5)Accordingtotheportfoliomodeldescriptionoftheactualoperation,maycausethecompanyprofitdeclineAdvantagesandLimitationsofPortfolioAnalysis3.Parentingstrategy:Themannerinwhichmanagementcoordinatesactivities,transfersresources,andcultivatescapabilitiesamongproductlinesandbusinessunits.Viewtheorganizationintermsofresourcesandcapabilitiesusedtobuildbusinessunitvalueandgeneratesynergiesacrossunits.Corporateparentingstrategydevelopment:ExamineeachbusinessunitintermsofitsstrategicfactorsExamineeachbusinessunitintermsofareasinwhichperformancecanbeimprovedAnalysishowwelltheparentcorporationfitswiththebusinessunits多元化战略优点，为什么，怎么实行