The articles of the encyclopaedias are arranged either in alphabetical or classified order depending upon the nature and size of articles and the editors plan for their presentation. Few encyclopaedias have long articles while the others have small ones. The arrangement of the articles in the encyclopaedia should be such that users can locate the information easily and quickly.
It is usually found that the articles are arranged either in word or letter by letter alphabetical order. They own comprehensive, alphabetically arranged index covering all the minor topics and giving `see' and `see also' cross-references wherever necessary. The table of contents listing the topics should lead the user to the necessary information. Some single volume encyclopaedia has detailed table of contents but not index. The multi-volume sets have a comprehensive index in the last volume with the cross-references.