Enterprise and supply chain planning (ERP and SCP) have evolved due to the earlier benefits of manufacturing planning systems. By integrating the entire enterprise, or a part of a supply chain, the benefits sought are hopefully even greater in terms of reduced costs and increased profits in comparison with systems only managing a part of the operations. Swedish manufacturing companies are no exceptions and this research aims at investigating enterprise and supply chain planning within those firms. A descriptive study of the current situation concerning implementation and the experiences of such planning systems in both enterprise and supply chain environments is presented. Further, two explorative studies in the field of supply chain integration and supply chain design are presented. These studies examine the impact on company performance by different planning and supply chain strategies.