@abc.abstractmethod<EOL><INDENT>def create_assessment(self, assessment_form):<DEDENT>
return<EOL>
Creates a new ``Assessment``.

        :param assessment_form: the form for this ``Assessment``
        :type assessment_form: ``osid.assessment.AssessmentForm``
        :return: the new ``Assessment``
        :rtype: ``osid.assessment.Assessment``
        :raise: ``IllegalState`` -- ``assessment_form`` already used in a create transaction
        :raise: ``InvalidArgument`` -- one or more of the form elements is invalid
        :raise: ``NullArgument`` -- ``assessment_form`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred
        :raise: ``Unsupported`` -- ``assessment_form`` did not originate from ``get_assessment_form_for_create()``

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