Imam Abu Hanifa was probably the most liberal of the four great Imams of fiqh. The Hanifi fiqh is thus flexible and adaptable. He saw Islamic law as an organic growth in which changes would be necessary from time to time as society evolved. He advocated the use of reason based on the Qur'an and the Sunnah in the consideration of religious questions. Imam Abu Hanifa was the first to compile and classify the Fiqh science; he collected information for each branch of knowledge. The Hanafi Madhhab spread during the time of the Ottoman Empire. Today, more than half of Muslims follow this approach.