Propædia

However, the Propædia also has several appendices listing the staff members, advisors and contributors to all three parts of the Britannica.

The Outline was an eight-year project of Mortimer J. Adler, published 22 years after he published a similar effort (the Syntopicon) that attempts to provide an overview of the relationships among the "Great Ideas" in Adler's Great Books of the Western World series.

It represents a twentieth-century scheme for the organization of knowledge that is more comprehensive than any other and that also accommodates the intellectual heterodoxy of our time.The lead author was Nigel Calder, who wrote the introduction "The Universe of the Physicist, the Chemist, and the Astronomer".

The lead author was Mark Van Doren, who wrote the introduction "The World of Art".

The lead author was Jacques Barzun, who wrote the introduction "The Point and Pleasure of Reading History".