The aim of this study was to examine the role of knowledge management (KM) in the ERP life cycle with a main focus on the implementation phase. A literature review on ERP and KM was conducted as the basis for a case study of the SAP implementation in one company within Aker Kvaerner, a global contractor of engineering services. The study indicates that the use of KM can make ERP implementations more effective by improving the knowledge sourcing ability among the implementation partners. Cost reductions and strategic business advantages are only some of the potential benefits of this. Several implications for practice were also identified, including the development of efficient communication routines in ERP implementations through improved knowledge transfer and reuse between the implementation partners.