The role of literacy as a fundamental human right and as a necessary prerequisite for social and economic development is currently acknowledged without restriction. It is generally accepted that literacy is a necessary condition for access to modernization process and, still more, to advanced technology-even if it is not sufficient in itself. Thus, countries raising their technological levels previously took required steps to universalize basic education and adult literacy so as to raise productivity levels by parallel increases in manpower and capital formation. But, important as above reasoning might appear, it falls short of explaining real benefit for individual, citizen, and, therefore, for society in becoming literate. Perhaps best interpretation of literacy is the liberation of a mind from bondage of dependence.' In any case, literacy is a major social concern and clearly a prerequisite to people's participation in public life, in implementing social policies (health, nutrition, family planning, etc.), and, as such, is a unique measure for development. The present article, based on provisional statistical data, attempts to summarize preliminary results of current research work in Unesco's Office of Statistics, with a view to assessing major trends in literacy (the impact of education in its broadest sense, i.e., not only of schooling, in eradication of illiteracy) and their implications in terms of projected literacy levels. In so doing, several points must be underlined. First, it is necessary to note that official statistics in field of literacy are generally based on data from censuses or surveys in which self-evaluation is method of measuring literacy levels. There is, no doubt, a high risk for large margins of error in assessment, leading us to underestimate magnitude of illiteracy. The only way to check reliability of data would be a postenumeration test given to a sample of adults declaring themselves literates at moment of census or survey. The test is foreseen
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