In 1951,in one of its first publications dealing with developing countries, the United Nations' Department of Economic Affairs distinguished four types of planning,each of which has been used in one form or another by most LDCs: First,planning refers only to the making of a program of public expenditure,expending over from one to ten year. Second, it refers sometimes to the setting of production targets,whether for private or for public enterprises,in terms of output. Third,the word may be used to describe a statement which sets targets for the economy as a whole,purporting to allocate all scarce resources among the various branches of the economy. Fourth,this term is sometimes used to describe the means which the government used to try to enforce upon private enterprise the targets which have been previously determianed.