@abc.abstractmethod<EOL><INDENT>def set_deadline(self, end):<DEDENT>
pass<EOL>
Sets the assessment end time.

        :param end: assessment end time
        :type end: ``timestamp``
        :raise: ``InvalidArgument`` -- ``end`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``

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