The document summarizes Generalized System of Preferences (GSP) and Global System of Trade Preferences (GSTP). GSP is a preferential tariff system extended by developed countries to developing countries to enhance their export earnings, promote industrialization, and encourage diversification of their economies. GSTP was negotiated in 1988 by developing countries to promote mutual trade and economic cooperation among them. It involves the exchange of tariff concessions on a limited number of products between participating developing countries. Rules of origin determine the eligibility of products from member countries for preferential tariff treatment under GSTP.