Editing Biographical evaluation (section)

===Narrator criteria===
A hadith is subject to criticism on the basis of two matters. The first relates to the continuity of the hadith's [[Science of hadith#The sanad and the matn|chain of narration]]; if there is [[Hadith terminology#Categories of discontinuity|discontinuity]] between two or more narrators, that hadith is criticized on this basis as discussed in depth in the [[hadith terminology]] article. The second relates to criticism of a narrator, or more, in the chain of narration of a particular hadith.<ref>''Nuzhah al-Nathar'', by Ibn Ḥajr, published as ''an-Nukat'', p. 108, ''Dar Ibn al-Jawzi'', Dammam, Saudi Arabia, sixth edition, 2001.</ref>

Hadith narrators are evaluated in light of two qualities in determining the overall grading of a hadith. These qualities are derived from the definition of a hadith that is [[Hadith terminology#Sahih|''sahih'']] constituting two of its five conditions. The first, uprightness (''al-ʻadālah''), is defined as the ability an individual possesses to adhere to moralistic decorum (''al-taqwā'') and maintaining proper social graces (''al-murūʼah''). The second, precision (''al-ḍabṭ''), is of two types, the first is pertaining to memorization and the second to writing. Precision in memorization (''ḍabṭ al-ṣadr'') refers to the ability to retain the specified information, recalling and conveying it at will. Precision in writing (''ḍabṭ al-kitāb'') is the preservation of the written information from the time it was heard until its transmission.<ref>''Nuzhah al-Nathar'', p. 83.</ref>