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O

on campus, on-campus
   Hyphenate when used as a compound modifier.

           We went to a theater workshop on campus.
           We went to an on-campus theater workshop.

online
   One word in all cases when referring to a computer internet connection

organizational charts  
   To see the administrative units in JMU's organizational structure refer to the chart maintained by the Office of the President.
   To see JMU's academic structure, refer to the chart maintained by the Division of Academic Affairs.