@abc.abstractmethod<EOL><INDENT>def register_for_changed_proficiencies_for_objective(self, objective_id):<DEDENT>
pass<EOL>
Registers for notification of an updated proficiency.

        ``ProficiencyReceiver.changedProficiencies()`` is invoked when
        the specified proficiency related to the given objective is
        changed in this objective bank.

        :param objective_id: the ``Id`` of the ``Objective`` to monitor
        :type objective_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``objective_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*