Which type of books should a library aim to update annually?

Updating non-fiction reference materials annually is crucial for a library because these resources are often used to provide accurate, up-to-date information that reflects current knowledge and developments in various fields. Non-fiction reference materials include encyclopedias, databases, and various guides that serve as primary sources for factual information. Given the pace at which information changes, especially in science, technology, and current events, ensuring that these materials are current helps maintain the credibility and reliability of the library’s offerings.

This commitment to updating non-fiction reference materials aligns with the users' needs for accurate and contemporary information, ensuring that patrons have access to the latest research, statistics, and discussions in any given subject area. By contrast, while other types of books like textbooks or fiction may also benefit from updates, they do not require the same frequency of revision as non-fiction reference materials, which serve an essential function in providing precise and current knowledge.