In this paper, we examine the role of knowledge management in the design, customization, and delivery of a family of electronically delivered products and services, specifically information products and e-services. We suggest that concepts underlying mass customization and product-line engineering can be applied to deliver customized and individualized products, and services, while allowing the provider to operate at mass production levels and simultaneously catering to the needs of individual customers. Further, we propose a framework for a traceability based knowledge management system to support the design, customization and delivery of information product and eservice families.