for(int i = 0; i < config.numberOfWorkers(); i++)
workGroup.addWorker(this.makeGrader(config));
this.listOfAssignment = new LinkedList<Assignment>();
while(true == ca.hasMoreAssignment())
{
Assignment assignment = ca.nextAssignment();
if(null != assignment)
{
this.listOfAssignment().add(assignment);
workGroup.pushWorkData(assignment);
}