The course section life cycle starts from its planning. Once the decision for opening the registration for the course is received, the course is opened. While the course is opened, the requests for registering can be accepted. The course will not be actually taught until the class size reaches a certain minimum. The requests to register are accepted until the course reaches the predefined maximum number of students, or the registration deadline has passed; in both cases, the course section becomes closed. If the class size is below the minimum, the class is cancelled. Closing the section when there are not enough students will have the same effect as cancelling it.

Draw a UML state machine diagram to specify Course Section behaviour. Use hierarchical states where appropriate: