@utilities.arguments_not_none<EOL><INDENT>def has_assessment_begun(self, assessment_taken_id):<DEDENT>
return self._get_assessment_taken(assessment_taken_id).has_started()<EOL>
Tests if this assessment has started.

        An assessment begins from the designated start time if a start
        time is defined. If no start time is defined the assessment may
        begin at any time. Assessment sections cannot be accessed if the
        return for this method is ``false``.

        arg:    assessment_taken_id (osid.id.Id): ``Id`` of the
                ``AssessmentTaken``
        return: (boolean) - ``true`` if this assessment has begun,
                ``false`` otherwise
        raise:  NotFound - ``assessment_taken_id`` is not found
        raise:  NullArgument - ``assessment_taken_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure occurred
        *compliance: mandatory -- This method must be implemented.*