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bernard czaja itbc2 it business consulting bernard czaja itil raci service strategy itil edition 2011 cabinet office best management practice business case intermediate level service portfolio management strategy management brm demand management financial management business relationship management foundation kosten akquisition provider vakanz spezialisten führungskräfte interim management service catalogue management service level management supplier management service design coordination service operation service transition continual service improvement service design practitioner prince2 edition 2009 ogc edition 2009 prince2 web-shop germany online markt deutschland online marktvolumen internet ecommerce business plan it service catalogue transfer price policy transferpreismodelle controlling preise it service management steuerung it service katalog design allocation cost calculation control service catalogue