Process orientation is often seen as a central starting point for optimizing business performance. This is especially true for supply chain workflows because modeling, understood as specifying activities, data, resources, and control flows, is usually the first step in selecting and implementing digital approaches such as smart factories, virtual agents, and autonomous systems. Many different process notations are known (e.g., detailed vs. rough, flexible vs. standardized, etc.), and at the same time, fundamentally different SCM process types make various assumptions about suitable modeling (e.g., integration of value chain partners, standardization). This chapter presents an association model that suggests which notation fits best to which SCM type. The chapter discusses the benefits of specific notations for classical as well as modern challenges of SCM to help in the selection of notations. The resulting specifications serve as the basis for the holistic digitization of supply chains.