 Ockham’s Summa of Logic is divided into three parts, with the third part subdivided into four subparts. Part I divides language, in accordance with Aristotle’s On Interpretation (1, 16a3–8, as influenced by Boethius’s interpretation), into written, spoken and mental language, with the written kind dependent on the spoken, and the spoken on mental language. Mental language, the language of thought, is thus the most primitive and basic level of language. Part I goes on to lay out a fairly detailed theory of terms, including the distinctions between (a) categorematic and syncategorematic terms, (b) abstract and concrete terms, and (c) absolute and connotative terms. Part I then concludes with a discussion of the five “predicables” from Porphyry’s Isagoge and of each of Aristotle’s categories.