수준별 수업 참고할 기사 http://www.hani.co.kr/arti/society/schooling/285640.html http://weekly.donga.com/docs/magazine/weekly/2006/07/31/200607310500017/200607310500017_1.html http://classroom.re.kr/uploadfile/content/content02/second02/data01/07/index.htm 참고문헌