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There is a problem here with the three chapter headings, which might have accumulated during transmission (see also Ch. 565 for a similar double title).

However, the structure of the Kitāb is far from random. Although it is one of the earliest books in Arabic, and lacks all the formal features, preface, list of contents, even a title, it is tightly organised according to a comprehensive plan which arranges the topics in the sequence Syntax, Morphology, Phonology.

The Kitāb falls naturally into two volumes (hence perhaps here the first extra title "full and partial inflection"), each beginning with a short chapter setting out the basic categories and principles of Syntax and Morphology respectively. Phonology comes last because Sībawayhi starts with whole utterances and gradually segments them into smaller and smaller constituents.

Jahn is not alone in commenting on this with implicit disapproval, though the French tradition is more sympathetic, with its première articulation and deuxième articulation (Martinet).

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