private void fillConceptList(Student student, JList<String> list) {
		bookingService = BookingService.getInstance();
		DefaultListModel<String> dlm = new DefaultListModel<String>();
		list.setModel(dlm);
		dlm.removeAllElements();

		Set<Activity> activities = student.getActivities();
		for (Activity a : activities) {
			dlm.addElement(a.getName());
		}

		String[] bookings = bookingService
				.isBookingAllDayOfWeekInMonth(student);
		for (String string : bookings) {
			if (string.compareTo("") != 0) {
				dlm.addElement(string);
			}
		}
	}