1955-2011 applecomputerinc applecomputers biography cas casestudies chiefexecutiveofficers computerindustry corporateturnarounds electronicofficemachineindustry entreprises führungsgrundsatz gestion histoire history ibm ibmcorporation incapplecomputer industrialmanagement industrie informatique internationalbusinessmachinescorporation jobs krisenmanagement machinesdebureau management redressement steve strategischmanagement unitedstates unternehmen unternehmenskrise étudesde