UPDATES: Changed the definition of group to be a collection of people, events, or tasks, and removed subcalendar to avoid being redundant.
In creating this lexicon, we specifically wanted to avoid making distinctions between things that are fundamentally the same. For example, we initially had "professors" and "courses" defined, where professors were people in charge of assigning tasks for a course. This position is fundamentally the same as a the president of a student government delegating action items to his/her student assembly. We spent a great deal of time discussing how to name the person(s) who "control" a group by managing and assigning tasks. We came to the conclusion that there is no justifiable need for a title of "administrator" in a group, and instead we should manage groups on an entirely peer to peer basis. This means that all members of a group should be able to control the calendar and tasks for the group.