As for Chih-i’s work Hsüan-i (The Profound Meaning of the Lotus Sūtra), it is composed of ten fascicles, and the interpretation of the Lotus Sūtra follows the five categories of analysis named “Five Sections” (Wu-chang) as a general guideline. These Five Sections are Chih-i’s own system of interpreting Buddhist sūtras. With the means of the “Five Sections” – Name (Ming), Substance (T’i), Gist (Tsung), Function (Yung), and Teaching (Chiao) – the interpretation is no longer passively following the scripture chapter by chapter. Rather, the interpretation is made according to these categories, and the revelation of the themes of the scripture is also revolved around these categories. As a result, Chih-i’s Hsüan-i is no longer limited to the nature of a commentary. It becomes the medium to express Chih-i’s own thought. Moreover, the Five Sections that are applied for the systematic interpretation of the Lotus Sūtra, refer to the structure of the text Hsüan-i itself. Within the domain of the Five Sections, a vast and complex structure of illustrations is laid out, focusing on the themes of the Lotus Sūtra. (Page XXII)

Postscript: Keeping this around for reference when I get to Volume 2.