MaterialflowCustomerserviceStage One: Baseline
PurchasingMaterial ControlProductionSalesDistributionMaterialflowCustomerserviceStage Two: Functional IntegrationMaterials ManagementManufacturing ManagementDistributionMaterialflowCustomerserviceStage Three: Internal IntegrationMaterials ManagementManufacturing ManagementDistributionMaterialflowCustomerserviceStage Four: External IntegrationSuppliersInternal Supply ChainCustomersFigure 3.3The progression to supply chain integration.Source: Stevens, 1989.