Problem
Write down a list of 10 random letters and numbers (like Y27S8D19KN0). Ask 2 people you know to act as your participants. Read the list to them out loud at a rate of about 1 item per second. Wait about 10 seconds, then ask them to write down the letters and numbers in the order they heard them.
How many items did they repeat back? Did they make any errors (write down an item that was not on the list)?