Input: Capital, manpower, material resources and intellectual investment.

Output: the content, quality, quantity, resource allocation and resource utilization rate of the library.

Change: use information technology to plan, organize and control the situation.

Shielding protection: actual loss level, abnormal loss.

This is the principle of efficiency.

According to the input-output theory, it is necessary to know the input-output quantity. Although it can be obtained from the funds, it can also quantitatively analyze the library's usage, maintenance costs, equipment wear and tear, etc., but it is impossible to know the specific income of each user. Therefore, the general library investment accounts for 3% ~ 10% of schools and other educational systems, and electronic media accounts for 10% ~ 25%.

For example, Nanjing University of Aeronautics and Astronautics, one of the universities under the national "2 1 1" project, has 2839 faculty members and 22022 full-time students, including undergraduate students 14978 and graduate students/564/kloc-0. The library of Nanjing University of Aeronautics and Astronautics is divided into two buildings. In addition to collecting more than 636,600 kinds of printing resources, there are also rich electronic resources, including 1 333,000 kinds of electronic books and periodicals. According to the management system of China Southern Airlines Library, the average annual profit is about 950,000 copies. Based on the average number of students in China Southern Airlines for three years, the library usage of each student is 395.8 books per year.

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