One of the effective factor behind the comprehension or Hadith, particularly those Ahadith. That were passed due to certain expediencies, is to know the secondary causes of the issue or Hadith.At times the secondary cause is mentioned in the context of a Hadith. The secondary causes are of different kinds. Sometime they will be issued following a question from an infallible Imam (a), and sometime it relates to certain historical event or incident. Those Hadith which have secondary cause are called Hadith musabbab. Cognition of such Hadith has certain advantages including understanding the meanings of Hadith and the intension or the infallible Imam (a), as well as better understanding the percepts, their philosophies removing differences among Ahadith, and understanding interpretation or the Quranic verses.