A work on Muslim schisms and sects, by Islamic Shafi'i scholar, Abu Mansur 'Abd al-Qahir ibn Tahir al-Baghdadi (d. 429/1037). Written as an explanation of the hadith about the division of the Muslim ummah into many sects, outlining the beliefs of the misguided and the one correct [Orthodox Sunni]. With explanation of the differences and what qualifies as the misguided.