Object-Oriented and Classical Software Engineering 8th Edition by Stephen Schach

Exercise 7

Consider an automated library circulation system. Every book has a bar code, and every borrower has a card bearing a bar code. When a borrower wishes to check out a book, the librarian scans the bar codes on the book and the borrower's card, and enters C at the computer terminal. Similarly, when a book is returned, it is again scanned and the librarian enters R. Librarians can add books (+) to the library collection or remove them (?). Borrowers can go to a terminal and determine all the books in the library by a particular author (the borrower enters A = followed by the author's name), all the books with a specific title ( T = followed by the title), or all the books in a particular subject area ( S = followed by the subject area). Finally, if a borrower wants a book currently checked out, the librarian can place a hold on the book so that, when it is returned, it will be held for the borrower who requested it ( H = followed by the number of the book). Explain how you would ensure a high percentage of reusable code artifacts.