Within the Hasidic world, the positions of spiritual leadership are dynastically transmitted within established families, usually from fathers to sons, while a small number of students obtain official ordination to become dayanim ("judges") on religious courts, poskim ("decisors" of Jewish law), as well as teachers in the Hasidic schools. The same is true for the non-Hasidic Litvish yeshivas that are controlled by dynastically transmitted rosh yeshivas and the majority of students will not become rabbis, even after many years of post-graduate kollel study.