BRITAIN'S Department for International Development (DfID) is widely regarded as a trend-setter in the aid business. Under Andrew Mitchell, the agency tightened spending, cut the number of countries receiving aid and ceased funding United Nations agencies for housing and economic development that it determined were not delivering. Now its new head, Justine Greening, wants to make the country's aid-giving more transparent. This should make it more effective. But Ms Greening's efforts may also end up embarrassing both the department and the recipients of its aid.