text: define(['backbone', 'js/models/settings/course_grader'], function(Backbone, CourseGrader) {
      var CourseGraderCollection = Backbone.Collection.extend({
          model: CourseGrader,
          sumWeights: function() {
              return this.reduce(function(subtotal, grader) { return subtotal + grader.get('weight'); }, 0);
          }
      });
  
      return CourseGraderCollection;
  }); // end define()
  