This is handy for helping a patron find the specific aspect of a general subject that is wanted. Under Computers, for instance, there are articles on Database management systems, Electronic mail, Software engineering, and Virtual reality, among others. The analytical index gives detailed subject access to the encyclopedia. Many subject headings have sub-headings. Information your patron wants may be in several locations, so do take advantage of the detailed index.
Science is organized knowledge.
There is a very useful section on scientific notation in this last volume. The questions are designed to give you some practice using what science tools you may have as well as reviewing what kinds of science information you can find in general sources.