@abc.abstractmethod<EOL><INDENT>def get_previous_unanswered_question(self, assessment_section_id, item_id):<DEDENT>
return<EOL>
Gets the previous unanswered question in this assesment section.

        :param assessment_section_id: ``Id`` of the ``AssessmentSection``
        :type assessment_section_id: ``osid.id.Id``
        :param item_id: ``Id`` of the ``Item``
        :type item_id: ``osid.id.Id``
        :return: the previous unanswered question
        :rtype: ``osid.assessment.Question``
        :raise: ``IllegalState`` -- ``has_previous_unanswered_question()`` is ``false``
        :raise: ``NotFound`` -- ``assessment_section_id or item_id is not found, or item_id not part of assessment_section_id``
        :raise: ``NullArgument`` -- ``assessment_section_id or item_id is null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

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