Planing of a modular Library Management System System Classes Book Responsibility: Handling books names, authors and ISBN's. Module: LibraryManagement.BookModule Namespace: LibraryManagement.Book User Responsibility: Handling users, including books loans Module: LibraryManagement.UserModule Namespace: LibraryManagement.User Loan Responsibility: Handling books loaning and returning, including checking delays Module: LibraryManagement.LoanModule Namespace:: LibraryManagement.Loan Notification Responsibility: Displaying notifications about delays, calculating delayes times, showing summaries Module: LibraryManagement.NotificationModule Namespace: LibraryManagement.Notification