Which of these is NOT a responsibility of a library's circulation unit?

• Checking books in and out for patrons: This is a core function of the circulation unit.
• Shelving returned materials and keeping the collection in order: While often done by pages or student workers, this task is typically managed or overseen by the circulation department to ensure materials are accessible.
• Registering new patrons for library cards: This is also a common responsibility of the circulation desk, as it involves setting up patron accounts for borrowing.
• Evaluating and selecting new books for the library's collection: This responsibility falls under collection development or acquisitions, which is a separate department from circulation. It involves librarians or specialists assessing materials for purchase based on criteria like relevance, budget, and community needs.

Therefore, the responsibility not handled by the circulation unit is evaluating and selecting new books.

The correct option is:

• Evaluating and selecting new books for the library's collection