Attempts to examine the fundamentals of Ibn al-Walid's epistemological doctrine as expressed in his opus `Damigh al-batil wa-hatf al-munadil,' which presents a comprehensive treatise of the Ismaili doctrines of the Medieval era in Yemen. Al-Walid's views on Al-Ghazali's refutation of the Batinites; Transmission of knowledge to the Muslims; Theory of knowledge.