EN
The article offers solution for weighting data which have been causing a recurring difficulty in all researches on social mobility: The data refering to the fathers of the surveyed person of the representative sample of a particular generational survey is not representative with regard to the father's generation, because the chance that fathers who had more than one child are more often remembered is higher than in case of those who had only one single child. (weight=1 (the number of borthers/sisters of the surveyed person+1) ) The present experiment confirms that : 1. relying on the method of weighting one can obtain more insight into the generation of fathers than without this method, 2. the mobility toward the group of the Hungarian basic, as well as toward the group of the higher educational system is siginificantly higher than previously assumed.