Final answer:
The middle orders are most likely to be forgotten due to the serial position effect, which suggests better recollection of items at the beginning and end of a list. Waiters can use strategies like creating vivid contexts to remember these middling items better.
Step-by-step explanation:
According to the serial position effect, a waiter trying to memorize multiple orders should pay particular attention to the middle orders because these are the ones they are most likely to forget. The serial position effect states that individuals tend to remember items at the beginning (primacy effect) and the end (recency effect) of a list better than those in the middle. By understanding this psychological concept, someone trying to remember a sequence of items, such as a waiter taking orders, can employ strategies to better remember the typically more forgettable middle items, like associating each order with a vivid and unique context.