This policy brief contains " Efficient Managing The Invitation System on Reasonability of Package Protect" written in korean. Volume : 71 Writer : Dr.Choon-Yong yi, Research Fellow and Dr.Ho-Jung Kim, Researcher Of Infrastructure & Construction Economics Research Division. (E-Mail: cyyi@krihs.re.kr Tel: 82-31-380-0339// E-Mail: hjkim@krihs.re.kr Tel: 82-31-380-0344)