Biographical evaluation
Biographical evaluation (Arabic: عِلْمُ الرِّجال, romanized: ʿilm al-rijāl; literally meaning 'Knowledge of Men', but more commonly understood as the Science of Narrators) refers to a discipline of Islamic religious studies within hadith terminology in which the narrators of hadith are evaluated. Its goal is to establish the credibility of the narrators, using both historic and religious knowledge, in order to distinguish authentic and reliable hadiths from unreliable hadiths.