The Summa Theologiae or Summa Theologica, often referred to simply as the Summa, is the best-known work of Thomas Aquinas, a scholastic theologian and Doctor of the Church. 

Questions are specific topics of discussion, whereas their corresponding Articles are further-specified facets of the parent question. For example, Part I, Question 2 ("The Existence of God") is divided into three articles: (1) "Whether the existence of God is self-evident?"; (2) "Whether it can be demonstrated that God exists?"; and (3) "Whether God exists?" Additionally, questions on a broader theme are grouped into Treatises, though the category of treatise is reported differently, depending on the source.

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