This article focuses on the Transition to socialism and intergenerational class mobility. The data from the 1984 Social Structure Survey in Czechoslovakia were used for the analysis.' This survey was carried out on a sample of the population over fifteen years of age, representative according to sex and age. The non-response rate was 8.8% and the final sample size was 18,829. In the foregoing analyses, origin is defined by the father's class at the time when a respondent (son, daughter) entered the labor force. Destination alternates the respondent's present class, entry class, and class at 40 years of age, for younger respondents this is equal to their present class, hereinafter Class 40. The two later variables mostly enter a cohort analysis, which substitutes the unfortunate lack of mobility data from the past. The higher industrialization rate in Czechoslovakia than in Hungary and Poland may be illustrated by the proportion of workers and farmers, together with farm workers, in the father's generation. The percentage of workers was 55% in Czechoslovakia, as compared to 33% in Hungary and 30% in Poland. On the other hand, the proportion of farmers was 22% in Czechoslovakia as compared to 49% in Hungary and 57% in Poland.