The present paper is a contribution to the discussion on the question of whether social differences in stature are due predominantly to social assortment or whether they represent a modification effect. The statures of 120 males and 114 females were measured, together with those of their parents. The target groups were “social climbers” and, for comparison, persons who had remained in the same social class as their parents. Moreover, 61 pairs of sibs were examined whereby in each case the one partner had risen up the social scale while the other had remained in his or her original class. Using the t-test, the height measurements of each group were compared with one another. It was shown that with respect to stature the “social climbers” placed themselves in the target class and diverged significantly both from their own parents and from their brothers and sisters who had not climbed the social scale. This fact was interpreted as an indication that the process of upward social mobility favours persons who are endowed with greater stature.