@abc.abstractmethod<EOL><INDENT>def get_assessments_started_during(self, start, end):<DEDENT>
return<EOL>
Gets all the assessments started by this agent during the given period of time inclusive.

        :param start: start time
        :type start: ``osid.calendaring.DateTime``
        :param end: end time
        :type end: ``osid.calendaring.DateTime``
        :return: the started assessments
        :rtype: ``osid.assessment.AssessmentTakenList``
        :raise: ``InvalidArgument`` -- ``end`` is less than ``start``
        :raise: ``NullArgument`` -- ``start`` or ``end`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

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