It is an important issue to choose one of the narrations when there are differences between them as much as determining the authentic hadiths. Hadith scholars had made this preference among the narrations due to the most confidential hadith and al-fuqaha had made this preference due to the preferrable narration. They had discussed this issue under the title of "Determining The Practicable Narration". This issue is so important for explaining the occurence of definite schools. From this aspect, the narrations about tashahhud and the preferences of them are noteworthy. The narrations that came from the companions of Muhammad (pbuh) had been preferred with different reasons by the founders of four main Islamic schools of law. It has seen that these reasons had been evaluated in different ways and acquired a different character. The criteria that al-fuqaha had taken into consideration while determining the preferred narrations and the evaluation of them will be discussed in terms of narrations about tashahhud from the aspect of determining more authentic narration.