the flow of a process
One way to measure the relationship of items in a quad is to classify them as Potential, Resistance, Current, and Outcome (or Power). In this manner, we can see how dramatic components operate on each other over the course of the story. Current simply means the flow of a process. When a dramatic current exists it does not necessarily create change. Rather, until it is directed to a specific purpose as Power, the current will have no impact at all. So in a quad, assigning one of the items as the current does not mean it will alter the course of the story. Instead, it might function to encourage purpose by providing a ready motivation. This is a useful tool for Authors since it allows for the subtle relationship of unused, inferred, threatened, or anticipated dramatic interactions that shape the fabric of a story in ways other than conflict.