This book focusses on the after sales business and presents the Service Parts Planning (SPP) solution which was developed by SAP in a joint effort with Caterpillar and Ford in order to address the specific planning problems of service parts. The book explains the processes, structures, and functions of this solution and is targeted at decision makers, project members and project managers who are involved in an implementation of SAP Service Parts Planning or for users who want to gain a better understanding of the state of art in spare parts planning and the SAP Service Parts Planning software.