This Primer was developed by Mr. Abdul Quium. It was prepared originally in a different form for discussion at the High-level Expert Group Meeting on Public-Private Partnerships for Infrastructure Development, 2-4 October 2007, Seoul, Republic of Korea, jointly organized by UNESCAP and the then Ministry of Planning and Budget, Republic of Korea. Comments and suggestions were made in the meeting. At different stages helpful comments and suggestions were also received from Mr. John Moon, Mr. Richard Alexander Roehrl and his other colleagues. Subsequently, changes were made in style and format and additional materials were included to accommodate those comments and views expressed.