The diagram of this sequence chart shows the cycle of events. This diagram shows the events of a process and how those events are related to each other. The type of this diagram is a sequence chart. There are four events in this diagram. All of them are related to each other and, the arrows show the connection of these events. The direction of the arrows represents the sequence of execution of the project. These sequence charts are very helpful for long and complicated projects. Various diagram shapes show the description of the events. In this diagram, the rectangular shape shows the description of the events.