Faqihs made ijtihad taking into account the orders and made judgments by evaluating many evidences. One of the reference points in these practices was the needs of the society and solutions were tried to be presented for the existing problems. Since the issues were approached in principle with the same method within the sect doctrine, the issues in consensus constituted the majority. But the lawyers of the same period and sect expressed their views on some issues based on different reasons. It has been observed that the jurists who came later and lived in different periods or geographies preferred one of these views, as well as mentioning a view other than this one. In parallel with these views, the fukahâ made preferences by expressing the opinion that is the basis of the fatwa, but it was observed that there were more than one preferences within the sect on the same issue. Although there are many factors that lead them to this, it has been observed that the difference in social needs has an important place in this regard.  Thus, in case of need, it was allowed to act with opinions other than the sect of which she was a follower, and some periodic licenses were mentioned. Thus, in case of need, it was allowed to act with opinions other than the sect of which he was a follower, and some periodic licenses were mentioned. In order to solve the problems, the issues were evaluated by mentioning the intra-sectarian and non-sectarian conflicts other than the opinions that are the basis of the fatwa. In the Republican era, scientists approached the issue with the same thought and sought solutions to the newly passed legal system and the needs of the society arising from it. Omer Nasuhi Bilmen is one of the important figures who received education in the Ottoman period and held many administrative and scientific positions and rose to the Presidency of Religious Affairs in the Republican period. In addition to writing the Hukuk-i İslamiyye ve Istılahat-i Fikhiyye Kamusu, which is a voluminous work in the field of fiqh, Bilmen also wrote the Buyuk Islam Ilmihali, in which he gave wide coverage to worship. Although he excelled in many subjects, Bilmen, who was considered competent in the field of fiqh, made a great effort in this regard. He approached the issue with the same method and, in case of need, mentioned the legal conflicts in his works in order to solve the problems of the society and presented it as an option. This approach is considered to be a periodic need and to provide solutions to the problems encountered. In our study, we will try to evaluate the reasons for this periodically by giving examples of the views that Bilmen mentioned in the context of this catechism.