This type of circular diagram is a visual representation of the process flow. It is also known as a 4 stages template. The 4 stages are: initiation, implementation, operation and termination. These stages are represented by the four circular segments in the center of the diagram that show different shapes as they progress from left to right. This type of circular diagram can be used to depict the entire process flow or just one part of it. It can also be used to depict how each stage interacts with other stages or with external factors such as customers, supplies, etc.