Drawing UML state diagrams?

Transition arrows' in the diagram are not states, they are "TRANSITION/ACTION/HAPPENING". For e.g. In the mentioned figure, "Scheduled" is the state, open is action after which it goes to "Open for enrollment" state. This "open" transition can be replaced more verbose with "is being opened" Unfortunately, the transition actions like scheduled/open are very easily confused for a state as well, but that is not the intent.

Transitions are NOT states. Transitions are the events that move an object from one state to the next. States are defined by the value of variables in the object and by the behaviour of the object.

Take for instance a Student object that has a value "new-waiting for approval" value. That student is not allowed to register for or attend classes. But the same student may be allowed to register for and attend classes if the value changes to "approved".

What's the difference? The student object actually has two states.

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