object WeightTable is
    components: Grade* and Percent*;
    description: (*
        A WeightTable displays the current percentages and their grades.
		A collection of Grades from A to F and a collection of percentages.
    *);
end WeightTable;

object Grade is string;

object Percent is integer;

operation ChangeScores is
 	inputs: WeightTable;
    outputs: WeightTable;
    precondition: ;
    postcondition: ;
    description: (*
		This operation is done by clicking on the on the modifiable cells and type in value. 
    *);
end ChangeScores;