https://projectresearch.co.kr/2017/06/07/%ea%b8%80%eb%a1%9c%eb%b2%8c-%ed%91%9c%ec%a4%80-pm-%eb%8b%a8%ec%96%b4%ec%a7%91-%ed%95%9c%ea%b8%80-%eb%b2%88%ec%97%ad-pmi-lexicon-of-project-management-terms-v3-1/