Prophet (peace be upon him and his family).
(c). Ijma`- this comes when there is no spe- cific mention in Qur'an or Tradition about a particular case. It specially refers to concepts which have been accepted throughout the Islamic history as Islamic concepts.
(d). Human reasoning or logic - this again comes when there is no specific mention in Qur'an, and Tradition.
Hence it is revelant for Muslim thinkers to seek solutions for the various problems of life, in the Qur'an. If there was no clear cut solution, then the true sayings of the Prophet (p.b.u.h. a.h.f.) are reviewed to get more satisfaction. If that was not enough, then Ijmd ` and Logic are used as a final resort.
This particular topic is the field of specialists who possess sound knowledge of Islam.