In this article we will first propose some definitions of generation gap, generation discontinuity, and generation difference, and amongst all of them, the generation gap will be emphasized as a social problem in Iran. Data shows that in both national research projects of 1379 and 1382, there are no significant mean difference between youth and older generation, as far as, the religious values, political values and social values are concerned. In some areas the mean difference among youth and older people have not been much different.
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