object Mode
   components: FreeAccess or LectureOnly or EnableProgram or Disable;
x      :
   precondition: (* None yet *);
   postcondition:(* Once a mode is selected, the current mode will change to the selected mode *);
   description:(*The Mode object allows the intrucstor to select an access mode for the students. 
               The four modes are FreeAccess, LectureOnly, EnableProgram, and Disable *);
end Mode;