Make a REA Model including cardinalities for the operating events, resources, and agents. Do not include information events.

XYZ Company makes masks. XYZs customers are retail companies. XYZ Supply does not sell to the general public. When customers need masks, they place an order online which updates the Sales Order Transaction file. When orders are received, a sales representative prints two copies of the customer sales order and one copy of a stock release document. The sales representative staples one copy of the customer sales order to the stock release and sends it to the warehouse department.

The other copy of the sales order is filed numerically in the sales department. If an item in the order is out of stock, the order and stock release will be held until all items are available to be picked in the warehouse. A warehouse clerk at the manufacturing site receives the stock release and sales order. With these documents the clerk will pick and scan the goods for each order using a handheld scanner. This serves to update the Pick Transaction file. Only in stock items can be ordered as no backorders are allowed. After the pick, the warehouse clerk forwards the inventory items ordered and the stock release and order documents to the shipping department. A shipping clerk proceeds to update the Shipment Transaction file for each pick event and prints the packing list and three copies of the shipping notice. The packing list is included in the package.

The shipping clerk gives the common carrier representative each customer's original shipping notice, and the packaged inventory items. The stock release, a copy of the shipping notice, and the sales order are stapled together and sent to the billing department. The last copy of the shipping notice is filed numerically in the Shipping Department. The Billing Department receives the customer order, stock release, and shipping notice documents. With these documents. A billing clerk then prepares the invoice and emails it to the customer. An electronic copy is saved in the department. Once the invoice has been sent, the billing clerk sends the sales order, stock release, and shipping notice to the Accounts Receivable Department.

At the end of each month, an accounts receivable clerk will email customers with balances owing. XYZ accepts installment payments. The cash receipts clerk receives the checks and updates the Cash Receipts Transaction file. The accounting manager electronically deposits the checks into the appropriate cash acct at the end of each business day.