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During 1976- 77 the Statistical Center of Iran launched a project to collect nationally representative data about fertility and family planning within the framework of the World Fertility Survey (WFS) program. The Iran Fertility Survey is the only nationally rep resentative survey which provides both detailedfertility i nformation and data about dete r minants of fertility in Iran for the 1970s. The purpose of this paper is to evaluate the quality of reporting for basic demographic characteristics such as age, age at marriage, marital status, fertility events, and infant and child mortality. Detailed analysis of the data suggests that the quality of the Iranian data is not lower than the quality of WFS data from other countries in Asia. On most items compared, the Iran Fertility Survey had an average or above average position among WFS countries. These findings have significant implications for further use and analysis of this unique data set.