Scheduling is more than knowing when the library opens and when it closes. It can also mean a scheduled time when teachers can visit with their students for general library visits, information literacy instruction, collaborative lesson plans, or presentations. While some school libraries may have an online schedule where teachers can find and reserve a time for a visit, others might prefer teachers schedule visits directly with staff in order to help everyone focus on the objective of the visit.
Whichever tools or approach your school library may use, explore the links in the Wakelet above for more information.
From the American Association of School Librarians Position Statements page