The transition from systems that provide a pre-defined product to ongoing relationships that focus on supporting dynamically changing customer needs over time is moving suppliers from a product-delivery mode to one in which through-life capability management is expected. Appropriately modeling both supply and demand provides participants in this context with a richer understanding of risks and risk mitigations associated with their delivery strategy. This tutorial presents foundational concepts for modeling approaches along with a number of modeling techniques that address different aspects of customer-supplier relationships in dynamic environments.