public int compareTo(Individual arg) {
		// Compare by class name first:
		String first = getClass().getSimpleName();
		String argFirst = arg.getClass().getSimpleName();
		int firstCompare = first.compareTo(argFirst);
		if (firstCompare != 0)
			return firstCompare;
		if (name != null && arg.name != null) {
			int secondCompare = name.compareTo(arg.name);
			if (secondCompare != 0)
				return secondCompare;
		}
		return (arg.id < id ? -1 : (arg.id == id ? 0 : 1));
	}