i. When entering a large credit sale, the clerk typed in the customer's account number as 45982 instead of 45892. That account number did not exist. The mistake was not caught until later in the week when the weekly billing process was run. Consequently, the customer was not billed for another week, delaying receipt of payment.
j. A visitor to the company's Web site entered 400 characters into the five-digit Zip code field, causing the server to crash.