In this Library Management System communication diagram, there are five objects involved: the Librarian, Book Inventory System, User History, Membership, and Transaction. The Librarian initiates the process by validating the member's membership. Upon verification, the Librarian checks if the member has exceeded the borrowing limit. If not, the Librarian proceeds to issue the book to the member. Subsequently, the Book Inventory System updates the book's status to borrowed. Here the user history is also updated, incrementing the number of books borrowed by the member.
