A customer may ask en employee about book availability (including a reserved book) or may pick a book from catalogue. The book, identification card and the membership card are scanned and any deliquent or overdue details are brought up for the employee to query any curiosity of the customer. If the customer does not have a deliquent rating, then he or she can hire up to a maximum of 10 books. However if the rating of customer is "unreliable", then a deposit of one rental period for each book is requested and limited to 2 books only. Once the amount payable has been received, the stock is updated and the book is handed to the customer together with the rental receipt. The customer pays by cash, credit card and electronic transfer. Each rental record stores (under the customer's account) the check-out and due-in dates, together with the identification of the employee. A separate rental record is created for each books hired. If the book has not been returned within two days of due date, and a second notice after another two days (and at that time the customer is noted as "deliquent", will receive overdue notice. FIGURE Q1(a) : Employee Rental Window Customer Verifier Customer -1.checkRating 1 verifyRating cust: Customer 1.1.1 findin Cache (cust: Customer) -1.1.1.1 getStanding ind 1.2 display Rating (rating: char) FIGURE Q1(b) A customer may ask en employee about book availability (including a reserved book) or may pick a book from catalogue. The book, identification card and the membership card are scanned and any deliquent or overdue details are brought up for the employee to query any curiosity of the customer. If the customer does not have a deliquent rating, then he or she can hire up to a maximum of 10 books. However if the rating of customer is "unreliable", then a deposit of one rental period for each book is requested and limited to 2 books only. Once the amount payable has been received, the stock is updated and the book is handed to the customer together with the rental receipt. The customer pays by cash, credit card and electronic transfer. Each rental record stores (under the customer's account) the check-out and due-in dates, together with the identification of the employee. A separate rental record is created for each books hired. If the book has not been returned within two days of due date, and a second notice after another two days (and at that time the customer is noted as "deliquent", will receive overdue notice. FIGURE Q1(a) : Employee Rental Window Customer Verifier Customer -1.checkRating 1 verifyRating cust: Customer 1.1.1 findin Cache (cust: Customer) -1.1.1.1 getStanding ind 1.2 display Rating (rating: char) FIGURE Q1(b)