During a memory test, diamond listens as a list of numbers is read to her. when the list is done she has to repeat the numbers from memory. each time she correctly recalls all of the numbers, another number is added to the list. if diamond has an average capacity of short-term storage, she should remember about (plus or minus 2) numbers before she starts making errors.

She can remember about seven items, with the number ranging from five to nine. The function of short term memory is to store bursts of information for a short duration of time. A phone number has seven digits, and that is a perfect example of the use of short term memory. People given a phone number can usually store it and recall it several minutes later, but in a week, they will forget.