@utilities.remove_null_proxy_kwarg<EOL><INDENT>@utilities.arguments_not_none<EOL>def get_assessment_part_item_design_session(self, *args, **kwargs):<DEDENT>
if not self.supports_assessment_part_lookup():  <EOL><INDENT>raise errors.Unimplemented()<EOL><DEDENT>if self._proxy_in_args(*args, **kwargs):<EOL><INDENT>raise errors.InvalidArgument('<STR_LIT>')<EOL><DEDENT>return sessions.AssessmentPartItemDesignSession(runtime=self._runtime)<EOL>
Gets the ``OsidSession`` associated with the assessment part item design service.

        return: (osid.assessment.authoring.AssessmentPartItemDesignSession)
                - an ``AssessmentPartItemDesignSession``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_assessment_part_item_design()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_assessment_part_lookup()`` is ``true``.*