Carrefour Company, a retail store dealing in expensive linens and clothing has a staff of about 25 salesclerks. The sales are done in cash or credit, using the store's own billing rather than credit cards. Most of the larger sales are on credit. Each salesclerk has his/her own sales book with prenumbered, three-copy, multicolored sales slips attached, but perforated. Only a central cash register is used, run by the store manager. He's been working for Mr. Tariq Mohammed, the store owner, for over 10 years. The cash register is physically positioned to monitor the entire store and the front door. All transactions are recorded in the salesclerks' sales books. The original and second copies for each sale are given to the cashier. The third copy is retained by the salesclerk in the sales book. When the sale is for cash, the customer pays the salesclerk, who marks all three copies "paid" and takes the money to the supervisor. The supervisor compares the clothing to the description on the invoice and the price on the sales tag. He also rechecks the clerk's calculations. Any corrections are approved by the salesclerk. The clerk changes his/her sales book at that time, and the items are packaged and given to the customer. A credit sale must be approved by the supervisor from an approved credit list after the salesclerk prepares the three-part invoice. Next, the supervisor enters the sale in his cash register as a credit or cash sale. The second copy of the invoice, which has been validated by the cash register, is given to the customer. Tariq must approve of any credit sales that exceed $1,000. At the end of the day, the salesclerks give their books to the supervisor, and the supervisor compares the totals to the cash register tape. He then creates a summary of the day's transactions. The cash is deposited in the bank the next morning by Tariq, and he receives a deposit slip, which he gives to the accounts receivable clerk. If Tariq is unable to deposit the money, the supervisor goes instead. The cashier's copies of the invoices are also given to the accounts receivable clerk along with a summary of the day's receipts. [1]