This learned work is the accumulated harvest of more than twenty years of profound research, as shown by the inclusion in the book's bibliography of numerous publications on the subject by the author, Rafael Talmon. The subject at hand is the reconstruction of the Arabic grammatical tradition in its earliest phase up to the time of the most famous grammarian of Arabic, Sibawayh (d. ca. A.D. 796), author of al-Kitab, “the Book,” and his teacher al-Khalil ibn Ahmad (d. between 777 and 791), author of the lexicographical Kitab al-Ayn. The discussion was triggered by Michael G. Carter in a few thought-provoking publications dating from the 1970s in which he identified Sibawayh and his immediate teachers (besides al-Khalil, Yunus ibn Habib [d. 798]) as the first real systematic grammarians of Arabic. In Carter's view, Sibawayh had a group of enthusiastic but still amateurish grammarians in mind when reference was made, twenty-two times, to naḥwiyyūn in his Kitab. Talmon could not and would not accept the idea of a sudden creation of Arabic grammar in free space and became engrossed in approaching this subject matter from various angles, analyzing both grammatical and historiographical aspects of the early history of the Arabic grammatical tradition. In his previous monograph, the voluminous Arabic Grammar in its Formative Age (Leiden: E. J. Brill, 1997), originally intended to be a mere chapter of the book under review here, Talmon deals exclusively with al-Khalil's role in the genesis and early development of the Arabic linguistic tradition. This was basically done to determine which parts of Kitab al-Ayn can be positively attributed to al-Khalil in order to compare al-Khalil's views with Sibawayh's and with those of other early grammarians from both the Basran and the Kufan schools to support the “Old Iraqi School” hypothesis, which is central in the present work.