The Shafii School of thought stipulates authority to four
sources of jurisprudence, also known as the Usul al-fiqh.
In hierarchical order the
usul al-fiqh consist of:
the Quran, the Sunnah of the Prophet, ijma' (consensus),
and qiyas. The Shafii school also refers to the opinions
of the Prophet's companions (primarily
Al-Khulafa
ar-Rashidun). The school, based on Shafii's books
ar-Risala fi Usul al-Fiqh and
Kitab al-Umm,
which emphasizes proper
istinbaat (derivation of
laws) through the rigorous application of legal principles
as opposed to speculation or conjecture.
The Shafii
school is considered one of the more conservative of the
four schools of Islamic jurisprudence, but there are many
adherents of the Shafii tradition who maintain liberal
views in practicing their religion