def get_applied_assessment_parts(self):
raise errors.Unimplemented()<EOL>
Qualifies ``is_cumulative()`` to apply to a specific list of assessment parts.

        If ``is_cumulative()`` is ``true,`` this method may return an
        empty list to mean all previous assessment parts.

        return: (osid.assessment.authoring.AssessmentPartList) - list of
                assessment parts
        raise:  IllegalState - ``is_cumulative()`` is ``false``
        raise:  OperationFailed - unable to complete request
        *compliance: mandatory -- This method must be implemented.*