A hotel processes room-service orders with parallel kitchen and sommelier preparation.
When a guest calls room service at The Evanstonian, the room-service manager takes down the order. She then submits an order ticket to the kitchen to begin preparing the food. She also gives an order to the sommelier to fetch wine from the cellar and to prepare any other alcoholic beverages. Finally, she assigns the order to the waiter. While the kitchen and the sommelier are doing their tasks, the waiter readies a cart. The waiter is also responsible for nonalcoholic drinks. Once the food, wine, and cart are ready, the waiter delivers it to the guest's room. After returning to the room-service station, the waiter debits the guest's account.
| Activity | Actor |
|---|---|
| Take Order | Room-service Manager |
| Prepare Food | Kitchen |
| Prepare Beverages | Sommelier |
| Ready Cart | Waiter |
| Deliver Order | Waiter |
| Debit Account | Waiter |