The Customer class represents any person who has registered with the library and is elegible to check out books. Its attributes are:

• Customer first name.
• Customer last name.
• Customer phone.

The Loan class represents an event that happens when one customer takes one book to the checkout counter, has the book and her library card scanned, and then takes the book home to read. Its attributes are:

• Date and time out.
• Scanner I.D., which identifies where the book was checked out.
• Date due.
• Date returned.

The association between customer and loan classes is:

• Each customer makes zero or more loans.
• Each loan is made by one and only one customer.

The Book-on-the-shelf class represents a physical volume that is either sitting on the library shelves or is checked out by a customer. Its attribute is:

• Copy number.

The association between loan and book-on-shelf classes is:

• Each loan checks out one and only one book-on-the-shelf.
• Each book-on-the-shelf is checked out by zero or more loans.

The Catalog Entry class represents the title and other information about books in the library. Its attributes are:

• Call number, which normally follows the Library of Congress standard.
• Title.
• Publication date.
• Publisher.
• International standard book number, or ISBN, assigned by the publisher.

The association between book-on-shelf and catalog entry classes is:

• Each book-on-the-shelf is represented by one and only one catalog entry.
• Each catlog entry represents one or more books on the shelf.

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