DIFFERENTIATION OF SUPPLY MANAGEMENT PROCESSES IN A GLOBAL MANUFACTURING COMPANY Riikka Kaipia *) Aki Laiho **) BIT Research Centre, Helsinki University of Technology P.OB. 5500 FI-02015 TKK, Espoo Finland *) Email: riikka.kaipia @tkk.fi, Tel: +358 50 3684759; Fax: +358 9 451 3665 **) Email: aki.laiho@tkk.fi