The use of the "Propædia" is its "Outline of Knowledge," which wants to organise all of everything people know. The Outline is thought through by the "Britannica"'s editors to decide which articles should be included in the "Micropædia" and "Macropædia". The Outline is also intended to be a study guide, and to tell a student who wants to learn a topic in depth what articles to use. However, libraries say that very few people use it, and reviewers recommend the encyclopedias to not print it anymore. The "Propædia" also has diagrams printed on transparent paper of big topics and a section which lists the people working together to make the encyclopaedia.