With the conception of Category Supply Management, Karl J. Grajczyk develops a comprehensive management approach for the development, control, and implementation of purchasing strategies for differentiated product groups. Based on a survey of international manufacturing companies, the author derives extensive recommendations for action for the cross-functional implementation of category-oriented supply management by industrial purchasing managers. Since the segmentation of purchasing volume into goods or material groups is widely adopted in companies, this work connects strategic approaches from purchasing practice with business-oriented product group research.