The Stocks-and-Flows (SaF) Ontology contains a set of classes that is composed of element classes from the Actor, Action, and Environment ontologies and is a component of the situation-independent part of the Unconventional Conflict Ontology. These SaF classes contain information about relationships among the element classes that crosses the lines of these ontologies and differs from the is-a relationships within these ontologies. The simplest of the SaF classes consist of Actions that increase or decrease a quantity associated with an Environmental class. The Environmental class is the “stock” and the increases and decreases are the “flows.” More complex SaF classes include additional types of relationships and component roles. There are three categories of SaF classes and eight subcategories. The categories are differentiated by the roles of the component classes. The subcategories divide the categories by the type of “stock.” There are 96 SaF classes, each with a single parent subcategory. Figure 7.1 illustrates the connection between rebuilding a building and the building, itself. This chapter describes the organization of the SaF Ontology and all of the SaF classes.