To achieve teams that have well-defined responsibilities, can work independently, and are optimized for flow, it is essential to detect and track dependencies and wait times between teams. In Making Work Visible, Dominica DeGrandis recommends the use of a Physical Dependency Matrix or “dependency tags” on kanban cards to identify and track dependencies, and infer the communication needed to make these dependencies work well: “Visualizing important cross-team information helps communicate across teams.”