There are two categories of states in the committee: Donors and Recipients. They have different preparation strategies and different roles at the Conference.
Donors are developed rich states which will decide to which projects prepared by Recipients they are going to donate.
Recipients are developing or least developed states which need investments to facilitate their economic growth. Recipients prepare development projects to be implemented within their borders and present them to Donors at the Conference.
Detailed information about preparation for the World Bank is available here.