In this UML collaboration diagram for Library Management System, the process of how a book is returned by a member is depicted. The member first returns the book to the librarian. The librarian then checks the rental history for any fines due to exceeding the return due date. If no fine is applicable, the librarian accepts the book and updates the inventory to reflect its return and availability in stock. Through interactions between the member and librarian objects, this diagram illustrates the handling of book returns within the library management system.