Both Haredi Judaism and Modern Orthodox Judaism accept a similar set of rules regarding Jewish status based on classical rabbinic Judaism, including both matrilineal descent and requirements that conversions be performed by Orthodox rabbis and that converts promise to strictly observe elements of traditional Judaism such as Shabbat and Niddah. However, their application of these rules have been different, and the difference has been increasing in recent years. Modern Orthodox authorities have been more inclined to rule in favor of Jewish status and to accept non-Orthodox Jews' word in doubtful cases involving people claiming to be Jews, while Haredi authorities have in recent years tended to presume non-Jewish status and require more stringent rules and standards of evidence in order for Jewish status to be proven, and have tended to distrust the evidence of Jews who are not personally Orthodox. Haredi rabbis have tended to look at a convert's current personal observance and to regard deficiencies or lack of Orthodoxy in current observance as evidence that the convert never intended to validly convert. In addition, the contemporary situation is further complicated by the fact that some Haredi rabbis no longer regard some Modern Orthodox rabbis as reliable.