(4.5.2.1) Make a map
Some people set the purpose of reading books to make a map to get information efficiently. They grasp the overall map of what kind of knowledge is in which section of the book, and when they need a knowledge they read the section to get information efficiently.
In the database management system, we use a data structure called "index" to reduce the time to search for information. The paper books also a have data structure to reduce the time to search. That is a table of contents and an index. en.icon