The document discusses enhancing the usability of libraries through an evidence-based approach. It defines usability as being easy to use, useful, and pleasant to use. There are three types of librarianship discussed - "lollipop librarianship" which focuses only on what patrons want, "broccoli librarianship" which focuses only on what is good for patrons, and evidence-based librarianship which seeks to integrate user needs, practitioner experience, and research evidence. The document advocates applying an evidence-based practice approach to evaluate and improve the usability of library services and resources.