Welcome to the topic of continuous quality improvement (CQI)! CQI: Diagrams provides diagramming tools that can be added to your CQI toolkit. This video lesson, The Relations Diagram, is the third of five. It describes how the relations diagram is constructed, interpreted, and used to identify cause-and-effect relationships. From this lesson, the viewer will understand how the relations diagram compares to and fits in with other types of diagrams.